%!PS-Adobe-2.0 %%Creator: dvips(k) 5.92b Copyright 2002 Radical Eye Software %%Title: survey-EATCS+.dvi %%Pages: 30 %%PageOrder: Ascend %%BoundingBox: 0 0 596 842 %%DocumentFonts: CMSY10 CMSY7 CMR8 CMMI12 CMR12 CMMI8 CMSY8 CMBX12 CMBX8 %%+ CMEX10 CMR6 CMMI6 MSBM10 CMMI10 CMBX10 %%EndComments %DVIPSWebPage: (www.radicaleye.com) %DVIPSCommandLine: dvips survey-EATCS+.dvi -o survey-EATCS+.ps %DVIPSParameters: dpi=600, compressed %DVIPSSource: TeX output 2006.03.02:1157 %%BeginProcSet: texc.pro %! /TeXDict 300 dict def TeXDict begin/N{def}def/B{bind def}N/S{exch}N/X{S N}B/A{dup}B/TR{translate}N/isls false N/vsize 11 72 mul N/hsize 8.5 72 mul N/landplus90{false}def/@rigin{isls{[0 landplus90{1 -1}{-1 1}ifelse 0 0 0]concat}if 72 Resolution div 72 VResolution div neg scale isls{ landplus90{VResolution 72 div vsize mul 0 exch}{Resolution -72 div hsize mul 0}ifelse TR}if Resolution VResolution vsize -72 div 1 add mul TR[ matrix currentmatrix{A A round sub abs 0.00001 lt{round}if}forall round 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All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.100) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def /FullName (CMMI6) readonly def /FamilyName (Computer Modern) readonly def /Weight (Medium) readonly def /ItalicAngle -14.04 def /isFixedPitch false def end readonly def /FontName /CMMI6 def /PaintType 0 def /FontType 1 def /FontMatrix [0.001 0 0 0.001 0 0] readonly def /Encoding 256 array 0 1 255 {1 index exch /.notdef put} for dup 0 /.notdef put readonly def /FontBBox{11 -250 1241 750}readonly def /UniqueID 5087381 def currentdict end currentfile eexec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cleartomark %%EndFont %%BeginFont: CMR6 %!PS-AdobeFont-1.1: CMR6 1.0 %%CreationDate: 1991 Aug 20 16:39:02 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def /FullName (CMR6) readonly def /FamilyName (Computer Modern) readonly def /Weight (Medium) readonly def /ItalicAngle 0 def /isFixedPitch false def end readonly def /FontName /CMR6 def /PaintType 0 def /FontType 1 def /FontMatrix [0.001 0 0 0.001 0 0] readonly def /Encoding 256 array 0 1 255 {1 index exch /.notdef put} for dup 0 /.notdef put readonly def /FontBBox{-20 -250 1193 750}readonly def /UniqueID 5000789 def currentdict end currentfile eexec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cleartomark %%EndFont %%BeginFont: CMEX10 %!PS-AdobeFont-1.1: CMEX10 1.00 %%CreationDate: 1992 Jul 23 21:22:48 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.00) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def /FullName (CMEX10) readonly def /FamilyName (Computer Modern) readonly def /Weight (Medium) readonly def /ItalicAngle 0 def /isFixedPitch false def end readonly def /FontName /CMEX10 def /PaintType 0 def /FontType 1 def /FontMatrix [0.001 0 0 0.001 0 0] readonly def /Encoding 256 array 0 1 255 {1 index exch /.notdef put} for dup 0 /parenleftbig put dup 1 /parenrightbig put dup 18 /parenleftbigg put dup 19 /parenrightbigg put dup 56 /bracelefttp put dup 58 /braceleftbt put dup 60 /braceleftmid put dup 62 /braceex put dup 80 /summationtext put readonly def /FontBBox{-24 -2960 1454 772}readonly def /UniqueID 5000774 def currentdict end currentfile eexec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All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. 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All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def /FullName (CMBX12) readonly def /FamilyName (Computer Modern) readonly def /Weight (Bold) readonly def /ItalicAngle 0 def /isFixedPitch false def end readonly def /FontName /CMBX12 def /PaintType 0 def /FontType 1 def /FontMatrix [0.001 0 0 0.001 0 0] readonly def /Encoding 256 array 0 1 255 {1 index exch /.notdef put} for dup 0 /.notdef put readonly def /FontBBox{-53 -251 1139 750}readonly def /UniqueID 5000769 def currentdict end currentfile eexec D9D66F633B846A97B686A97E45A3D0AA052A014267B7904EB3C0D3BD0B83D891 016CA6CA4B712ADEB258FAAB9A130EE605E61F77FC1B738ABC7C51CD46EF8171 9098D5FEE67660E69A7AB91B58F29A4D79E57022F783EB0FBBB6D4F4EC35014F D2DECBA99459A4C59DF0C6EBA150284454E707DC2100C15B76B4C19B84363758 469A6C558785B226332152109871A9883487DD7710949204DDCF837E6A8708B8 2BDBF16FBC7512FAA308A093FE5F0364CD5660F74BEE96790DE35AFA90CCF712 B1805DA88AE375A04D99598EADFC625BDC1F9C315B6CF28C9BD427F32C745C99 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%%CreationDate: 1991 Aug 15 07:20:57 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. 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%!PS-AdobeFont-1.1: CMSY8 1.0 %%CreationDate: 1991 Aug 15 07:22:10 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. All Rights Reserved) readonly def /FullName (CMSY8) readonly def /FamilyName (Computer Modern) readonly def /Weight (Medium) readonly def /ItalicAngle -14.035 def /isFixedPitch false def end readonly def /FontName /CMSY8 def /PaintType 0 def /FontType 1 def /FontMatrix [0.001 0 0 0.001 0 0] readonly def /Encoding 256 array 0 1 255 {1 index exch /.notdef put} for dup 0 /.notdef put readonly def /FontBBox{-30 -955 1185 779}readonly def /UniqueID 5000818 def currentdict end currentfile eexec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cleartomark %%EndFont %%BeginFont: CMMI8 %!PS-AdobeFont-1.1: CMMI8 1.100 %%CreationDate: 1996 Jul 23 07:53:54 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.100) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. 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0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000 cleartomark %%EndFont %%BeginFont: CMR12 %!PS-AdobeFont-1.1: CMR12 1.0 %%CreationDate: 1991 Aug 20 16:38:05 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. 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0000000000000000000000000000000000000000000000000000000000000000 cleartomark %%EndFont %%BeginFont: CMR8 %!PS-AdobeFont-1.1: CMR8 1.0 %%CreationDate: 1991 Aug 20 16:39:40 % Copyright (C) 1997 American Mathematical Society. All Rights Reserved. 11 dict begin /FontInfo 7 dict dup begin /version (1.0) readonly def /Notice (Copyright (C) 1997 American Mathematical Society. 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end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.5) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(these)38 b(languages)e(form)f(a)h(language)f(v)-5 b(ariet)m(y)36 b(\(see)i([)2242 573 y SDict begin H.S end 2242 573 a Fx(58)2339 509 y SDict begin H.R end 2339 509 a 2339 573 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Straubing02) cvn H.B /ANN pdfmark end 2339 573 a Fx(])f(for)f(a)g(meta-explanation)e(of)257 693 y(this)h(phenomenon\))g(and)g(it)e(b)s(ecomes)i(p)s(ossible)f(to)h (use)g(computations)f(on)g(the)i(syn-)257 814 y(tactic)j(monoid)e(in)h (the)h(decision)f(pro)s(cedure.)64 b(This)39 b(approac)m(h)g(yields)f (decidabilit)m(y)257 934 y(results)d(for)e(v)-5 b(arious)34 b(classes)h(of)e(\034rst-order)h(form)m(ulas)f([)2361 934 y SDict begin H.S end 2361 934 a Fx(42)2458 870 y SDict begin H.R end 2458 870 a 2458 934 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.McnaughtonP) cvn H.B /ANN pdfmark end 2458 934 a Fx(,)2520 934 y SDict begin H.S end 2520 934 a Fx(55)2617 870 y SDict begin H.R end 2617 870 a 2617 934 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Straubing94) cvn H.B /ANN pdfmark end 2617 934 a Fx(,)2678 934 y SDict begin H.S end 2678 934 a Fx(68)2776 870 y SDict begin H.R end 2776 870 a 2776 934 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TherienW98) cvn H.B /ANN pdfmark end 2776 934 a Fx(])h(and)g Fo(F)m(O)g Fx(form)m(u-)257 1054 y(las)h(augmen)m(ted)h (with)e(mo)s(dular)g(quan)m(ti\034ers)i([)2028 1054 y SDict begin H.S end 2028 1054 a Fx(57)2125 990 y SDict begin H.R end 2125 990 a 2125 1054 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Straubing01) cvn H.B /ANN pdfmark end 2125 1054 a Fx(,)2188 1054 y SDict begin H.S end 2188 1054 a Fx(59)2285 990 y SDict begin H.R end 2285 990 a 2285 1054 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.StraubingT01) cvn H.B /ANN pdfmark end 2285 1054 a Fx(,)2348 1054 y SDict begin H.S end 2348 1054 a Fx(60)2445 990 y SDict begin H.R end 2445 990 a 2445 1054 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.StraubingTT95) cvn H.B /ANN pdfmark end 2445 1054 a Fx(,)2508 1054 y SDict begin H.S end 2508 1054 a Fx(66)2605 990 y SDict begin H.R end 2605 990 a 2605 1054 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT05b) cvn H.B /ANN pdfmark end 2605 1054 a Fx(])g(as)f(w)m(ell)g(as)g(temp)s(oral) 257 1175 y(logics)f([)553 1175 y SDict begin H.S end 553 1175 a Fx(20)651 1111 y SDict begin H.R end 651 1111 a 651 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.CohenPP93) cvn H.B /ANN pdfmark end 651 1175 a Fx(,)713 1175 y SDict begin H.S end 713 1175 a Fx(36)811 1111 y SDict begin H.R end 811 1111 a 811 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Kamp68) cvn H.B /ANN pdfmark end 811 1175 a Fx(,)873 1175 y SDict begin H.S end 873 1175 a Fx(68)971 1111 y SDict begin H.R end 971 1111 a 971 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TherienW98) cvn H.B /ANN pdfmark end 971 1175 a Fx(,)1033 1175 y SDict begin H.S end 1033 1175 a Fx(69)1131 1111 y SDict begin H.R end 1131 1111 a 1131 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TherienW04) cvn H.B /ANN pdfmark end 1131 1175 a Fx(].)51 b(There)37 b(ha)m(v)m(e)g(b)s(een)f(attempts)f(to)g(use)h (the)g(same)f(approac)m(h)257 1295 y(to)47 b(decide)h(logically)c (de\034ned)k(classes)g(of)f(regular)f(tree)i(languages)f(although)f (this)257 1416 y(extension)34 b(faces)f(a)f(n)m(um)m(b)s(er)h(of)f(tec) m(hnical)g(h)m(urdles)h(\(see)h(e.g.)65 b([)2654 1416 y SDict begin H.S end 2654 1416 a Fx(24)2752 1351 y SDict begin H.R end 2752 1351 a 2752 1416 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.EsikW05) cvn H.B /ANN pdfmark end 2752 1416 a Fx(]\).)404 1536 y(F)-8 b(or)32 b(t)m(w)m(o)i(elemen)m (ts)g Fv(a;)17 b(b)34 b Fx(of)f(a)g(group)g Fv(G)g Fx(recall)f(that)h (the)h(comm)m(utator)e Fu([)p Fv(a;)17 b(b)p Fu(])34 b Fx(of)f Fv(a)257 1656 y Fx(and)g Fv(b)g Fx(is)g(the)g(group)f(elemen) m(t)h Fv(a)1476 1620 y Fs(\000)p Fw(1)1570 1656 y Fv(b)1611 1620 y Fs(\000)p Fw(1)1706 1656 y Fv(ab)p Fx(.)44 b(Clearly)32 b Fu([)p Fv(a;)17 b(b)p Fu(])29 b(=)f(1)2580 1671 y Ft(G)2671 1656 y Fx(if)k(and)h(only)f(if)f Fv(a)i Fx(and)257 1777 y Fv(b)d Fx(comm)m(ute.)41 b(A)29 b(group)g Fv(G)g Fx(is)f Fr(nilp)-5 b(otent)32 b(of)f(class)f Fu(1)f Fx(if)f(it)g(is)g(Ab)s (elian)g(and,)i(inductiv)m(ely)257 1897 y(is)38 b Fr(nilp)-5 b(otent)39 b(of)h(class)f Fv(k)i Fx(if)c(the)i(subgroup)f Fu([)p Fv(G;)17 b(G)p Fu(])38 b Fx(generated)h(b)m(y)g(its)e(comm)m (utators)257 2017 y(is)i(nilp)s(oten)m(t)e(of)i(class)f Fv(k)30 b Fq(\000)d Fu(1)p Fx(.)62 b(W)-8 b(e)39 b(denote)h(as)f Fo(Ab)p Fx(,)h Fo(G)2383 2032 y Fl(nil)p Ft(;)p Fl(k)2579 2017 y Fx(and)f Fo(G)2863 2032 y Fl(nil)2996 2017 y Fx(resp)s(ectiv)m (ely)257 2138 y(the)29 b(class)g(of)f(Ab)s(elian)e(groups,)k(nilp)s (oten)m(t)d(groups)i(of)e(class)i Fv(k)i Fx(and)e(nilp)s(oten)m(t)e (groups.)257 2258 y(These)43 b(classes)f(form)d(pseudo-v)-5 b(arieties)41 b(and)g(there)g(are)g(go)s(o)s(d)f(descriptions)g(of)h (the)257 2379 y(corresp)s(onding)33 b(regular)e(languages.)404 2499 y(A)41 b(w)m(ord)h Fv(u)h Fu(=)g Fv(a)1037 2514 y Fw(1)1093 2499 y Fv(:)17 b(:)g(:)f(a)1275 2514 y Ft(t)1347 2499 y Fx(with)41 b Fv(a)1629 2514 y Ft(i)1700 2499 y Fq(2)j Fu(\006)e Fx(is)f(a)g Fr(subwor)-5 b(d)41 b Fx(of)g Fv(w)46 b Fq(2)d Fu(\006)2913 2463 y Fs(\003)2995 2499 y Fx(if)d Fv(w)k Fx(can)e(b)s(e)257 2619 y(factorized)35 b(as)h Fv(w)900 2634 y Fw(0)939 2619 y Fv(a)990 2634 y Fw(1)1030 2619 y Fv(w)1100 2634 y Fw(1)1155 2619 y Fv(:)17 b(:)g(:)g(w)1357 2634 y Ft(t)p Fs(\000)p Fw(1)1476 2619 y Fv(a)1527 2634 y Ft(t)1557 2619 y Fv(w)1627 2634 y Ft(t)1692 2619 y Fx(and)35 b(w)m(e)i(denote)f(b)m(y)2486 2539 y Fk(\000)2532 2575 y Ft(w)2538 2654 y(u)2584 2539 y Fk(\001)2665 2619 y Fx(the)g(n)m(um)m(b)s(er)g(of)f(suc)m(h)257 2740 y(factorizations.)41 b(W)-8 b(e)28 b(sa)m(y)i(that)e(a)g(language) f Fv(L)i Fr(c)-5 b(ounts)30 b(subwor)-5 b(ds)31 b(of)f(length)h Fv(k)j Fr(mo)-5 b(dulo)257 2860 y Fv(m)30 b Fx(if)f(mem)m(b)s(ership)g (of)g Fv(w)j Fx(in)d Fv(L)h Fx(dep)s(ends)h(on)f(the)g(v)-5 b(alues)29 b(mo)s(dulo)f Fv(m)i Fx(of)2950 2779 y Fk(\000)3007 2816 y Ft(w)2996 2894 y(u)3037 2903 y Fj(1)3071 2779 y Fk(\001)3117 2860 y Fv(;)17 b(:)g(:)g(:)e(;)3335 2779 y Fk(\000)3389 2816 y Ft(w)3381 2894 y(u)3422 2902 y Fi(t)3450 2779 y Fk(\001)257 2980 y Fx(for)32 b(some)f(w)m(ords)i Fv(u)984 2995 y Ft(i)1043 2980 y Fx(eac)m(h)g(ha)m(ving)e(length)g(at)h (most)f Fv(k)s Fx(.)43 b(It)32 b(w)m(as)h(sho)m(wn)g(in)e([)3080 2980 y SDict begin H.S end 3080 2980 a Fx(67)3177 2916 y SDict begin H.R end 3177 2916 a 3177 2980 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Therien83) cvn H.B /ANN pdfmark end 3177 2980 a Fx(])h(that)f(a)257 3101 y(regular)24 b(language)g Fv(K)32 b Fx(b)s(elongs)25 b(to)f Fv(L)p Fu(\()p Fo(G)1740 3116 y Fl(nil)p Ft(;)p Fl(k)1898 3101 y Fu(\))g Fx(if)g(and)h(only)g(if)f(there)h(exists)h Fv(m)i Fq(\025)g Fu(1)d Fx(suc)m(h)257 3221 y(that)k Fv(L)h Fx(coun)m(ts)g(sub)m(w)m(ords)i(of)d(length)f Fv(k)33 b Fx(mo)s(dulo)27 b Fv(m)p Fx(.)43 b(In)29 b(particular,)g(if)f (the)h(syn)m(tactic)257 3342 y(monoid)e(of)i Fv(K)36 b Fx(is)28 b(an)h(Ab)s(elian)e(group)i(then)h(mem)m(b)s(ership)e(of)g Fv(w)j Fx(in)e Fv(K)36 b Fx(dep)s(ends)30 b(solely)257 3462 y(on)35 b(the)h(n)m(um)m(b)s(er)f(of)f(o)s(ccurrences)j(of)d(eac)m (h)i(letter)f(mo)s(dulo)e(some)h(in)m(teger)h Fv(m)p Fx(.)51 b(There)257 3582 y(also)31 b(exists)h(an)f(explicit,)f(alb)s (eit)f(more)h(complex,)h(description)g(of)g(regular)f(languages)257 3703 y(whose)45 b(syn)m(tactic)f(monoid)d(is)i(a)g(solv)-5 b(able)42 b(group)h(but)g(all)e(attempts)i(to)g(pro)m(vide)g(a)257 3823 y(useful)27 b(description)f(of)f(languages)h(corresp)s(onding)g (to)g(groups)h(in)f(general)f(ha)m(v)m(e)j(failed)257 3944 y(b)s(ecause)39 b(of)f(our)f(v)m(ery)i(limited)c(understanding)j (of)f(non-solv)-5 b(able)36 b(groups.)60 b(F)-8 b(or)37 b(an)m(y)257 4064 y(pseudo-v)-5 b(ariet)m(y)31 b Fo(H)f Fx(of)g(groups,)h(w)m(e)g(will)d(denote)j(b)m(y)p 2238 3984 88 4 v 31 w Fo(H)f Fx(the)h(class)f(of)g(monoids)f(whose)257 4184 y(subgroups)34 b(lie)d(in)h Fo(H)p Fx(.)404 4305 y(A)i(monoid)e(is)h Fr(ap)-5 b(erio)g(dic)33 b Fx(\(or)g(group-free\))h (if)f(it)g(con)m(tains)h(no)f(non-trivial)e(group.)257 4425 y(Groups)k(and)f(ap)s(erio)s(dics)f(are)h(in)f(some)h(sense)i(t)m (w)m(o)f(extreme)g(cases)g(of)f(monoids)f(and)257 4545 y(they)j(can)f(b)s(e)g(used)h(as)f(building)e(blo)s(c)m(ks)i(to)f (construct)i(all)d(monoids)g(via)h(semidirect)257 4666 y(pro)s(ducts)g([)689 4666 y SDict begin H.S end 689 4666 a Fx(46)786 4602 y SDict begin H.R end 786 4602 a 786 4666 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Pin97) cvn H.B /ANN pdfmark end 786 4666 a Fx(].)404 4786 y(An)27 b(elemen)m(t)h Fv(e)f Fx(of)g Fv(M)38 b Fx(is)27 b Fr(idemp)-5 b(otent)27 b Fx(if)f Fv(e)1937 4750 y Fw(2)2004 4786 y Fu(=)i Fv(e)p Fx(.)42 b(F)-8 b(or)26 b(a)i(\034nite)f(monoid)e Fv(M)39 b Fx(there)28 b(is)257 4907 y(a)g(minimal)23 b(in)m(teger)28 b Fv(!)t Fx(,)g(called)f Fv(M)10 b Fx('s)29 b(exp)s(onen)m(t,)h(suc)m(h)g(that)d Fv(m)2566 4870 y Ft(!)2645 4907 y Fx(is)g(idemp)s(oten)m(t)g(for)g(all)257 5027 y Fv(m)h Fq(2)g Fv(M)10 b Fx(.)43 b(W)-8 b(e)28 b(de\034ne)h(the)g(pseudo-v)-5 b(ariet)m(y)28 b Fo(DO)g Fx(as)g(the)g(class)g(of)f(\034nite)h(monoids)e(that)257 5147 y(satisfy)42 b(the)f(iden)m(tit)m(y)g Fu(\()p Fv(xy)t Fu(\))1299 5111 y Ft(!)1349 5147 y Fu(\()p Fv(y)t(x)p Fu(\))1532 5111 y Ft(!)1582 5147 y Fu(\()p Fv(xy)t Fu(\))1765 5111 y Ft(!)1857 5147 y Fu(=)i(\()p Fv(xy)t Fu(\))2159 5111 y Ft(!)2209 5147 y Fx(.)69 b(This)42 b(pseudo-v)-5 b(ariet)m(y)41 b(and)h(its)257 5268 y(sub)s(classes)e(has)f(found)f (considerable)g(imp)s(ortance)f(b)s(oth)h(in)f(language)g(theory)i(and) 257 5388 y(in)33 b(applications)d(to)j(complexit)m(y)f([)1557 5388 y SDict begin H.S end 1557 5388 a Fx(63)1655 5324 y SDict begin H.R end 1655 5324 a 1655 5388 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT02b) cvn H.B /ANN pdfmark end 1655 5388 a Fx(])h(and)g(is)f(the)i(fo)s(cus)f(of)f(the)i (results)f(surv)m(ey)m(ed)j(in)p eop end %%Page: 6 6 TeXDict begin 6 5 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.6) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(the)35 b(sequel.)48 b(The)35 b(follo)m(wing)c(lemma)h(pro)m(vides)j(an)f (alternativ)m(e)f(c)m(haracterization)g(of)257 693 y Fo(DO)g Fx(whic)m(h)g(is)f(often)h(more)e(useful.)257 693 y SDict begin H.S end 257 693 a 257 693 a SDict begin 14.5 H.A end 257 693 a 257 693 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.2) cvn H.B /DEST pdfmark end 257 693 a 207 x Fn(Lemma)37 b(2.)42 b Fr(A)35 b(monoid)f Fv(M)46 b Fr(do)-5 b(es)34 b(not)h(b)-5 b(elong)33 b(to)i Fo(DO)g Fr(if)g(and)f(only)h(if)403 1106 y Fq(\017)48 b Fv(M)e Fr(is)34 b(divide)-5 b(d)34 b(by)h(the)g(syntactic)g(monoid)e(of)i Fu(\()p Fv(ab)p Fu(\))2405 1070 y Fs(\003)2445 1106 y Fr(;)g(or)403 1312 y Fq(\017)48 b Fv(M)e Fr(is)34 b(divide)-5 b(d)34 b(by)h(the)g(syntactic)g(monoid)e(of)i Fq(f)p Fv(a;)17 b(b)p Fq(g)2473 1276 y Fs(\003)2512 1312 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)2850 1276 y Fs(\003)2890 1312 y Fr(;)35 b(or)403 1518 y Fq(\017)48 b Fv(M)e Fr(is)34 b(a)h Fv(T)887 1533 y Ft(q)925 1518 y Fr(-monoid)e(for)i(some)f Fv(q)d Fq(\025)d Fu(2)p Fr(,)35 b(i.e.)f(ther)-5 b(e)35 b(ar)-5 b(e)34 b(idemp)-5 b(otents)34 b Fv(e;)17 b(f)38 b Fq(2)28 b Fv(M)501 1639 y Fr(such)35 b(that)g Fu(\()p Fv(ef)11 b Fu(\))1102 1603 y Ft(q)1140 1639 y Fv(e)28 b Fu(=)f Fv(ef)46 b Fr(but)35 b Fu(\()p Fv(ef)11 b Fu(\))1799 1603 y Ft(r)1865 1639 y Fq(6)p Fu(=)27 b Fv(ef)46 b Fr(when)34 b Fv(q)39 b Fr(do)-5 b(es)34 b(not)h(divide)f Fv(r)s Fr(.)404 1845 y Fx(F)-8 b(or)29 b(an)m(y)h(pseudo-v)-5 b(ariet)m(y)30 b(of)f(groups)h Fo(H)p Fx(,)g(it)e(is)i(p)s(ossible)f (to)g(giv)m(e)g(a)h(com)m(binatorial)257 1965 y(description)d(of)g(the) h(regular)e(languages)h(with)g(syn)m(tactic)h(monoids)e(in)h Fo(DO)12 b Fq(\\)p 3158 1885 88 4 v 12 w Fo(H)27 b Fx(using)257 2086 y(unam)m(biguous)40 b(concatenations.)67 b(F)-8 b(or)40 b Fv(a)h Fq(2)h Fu(\006)f Fx(and)f Fv(L;)17 b(K)49 b Fq(\022)41 b Fu(\006)2703 2050 y Fs(\003)2743 2086 y Fx(,)i(w)m(e)e(sa)m(y)h(that)e(the)257 2206 y(concatenation)47 b Fv(LaK)56 b Fx(is)47 b Fr(p)-5 b(erfe)g(ctly)48 b(unambiguous)f Fx(if)f Fv(L)54 b Fq(\022)f Fu(\(\006)33 b Fq(\000)g(f)p Fv(a)p Fq(g)p Fu(\))3054 2170 y Fs(\003)3140 2206 y Fx(or)47 b Fv(K)61 b Fq(\022)257 2327 y Fu(\(\006)29 b Fq(\000)g(f)p Fv(a)p Fq(g)p Fu(\))689 2290 y Fs(\003)728 2327 y Fx(.)72 b(If)42 b Fv(LaK)49 b Fx(is)41 b(p)s(erfectly)h(unam)m(biguous)g(then)g (an)m(y)g Fv(w)k Fq(2)e Fv(LaK)50 b Fx(can)42 b(b)s(e)257 2447 y(uniquely)28 b(factorized)g(as)g Fv(w)1276 2462 y Ft(L)1328 2447 y Fv(aw)1449 2462 y Ft(K)1545 2447 y Fx(with)f Fv(w)1832 2462 y Ft(L)1912 2447 y Fq(2)h Fv(L)g Fx(and)g Fv(w)2355 2462 y Ft(K)2451 2447 y Fq(2)g Fv(K)35 b Fx(since)28 b(the)h Fv(a)f Fx(can)g(only)257 2567 y(b)s(e)33 b(the)g(\034rst)g(or)f(last)g(o)s(ccurrence)i(of)e Fv(a)h Fx(in)f Fv(w)s Fx(.)257 2567 y SDict begin H.S end 257 2567 a 257 2567 a SDict begin 14.5 H.A end 257 2567 a 257 2567 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.3) cvn H.B /DEST pdfmark end 257 2567 a 207 x Fn(Lemma)37 b(3)h(\([)823 2774 y SDict begin H.S end 823 2774 a Fn(65)935 2709 y SDict begin H.R end 935 2709 a 935 2774 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT05) cvn H.B /ANN pdfmark end 935 2774 a Fn(]\).)j Fr(A)35 b(language)f Fv(K)42 b Fr(has)34 b(its)h(syntactic)g(monoid)f(in)g Fo(DO)22 b Fq(\\)p 3186 2693 88 4 v 23 w Fo(H)34 b Fr(i\033)h(it)257 2894 y(b)-5 b(elongs)37 b(to)h(the)g(smal)5 b(lest)37 b(language)g(variety)h(close)-5 b(d)37 b(under)g(p)-5 b(erfe)g(ctly)38 b(unambiguous)257 3014 y(c)-5 b(onc)g(atenations)37 b(which)g(c)-5 b(ontains)37 b(the)h(languages)e Fu(\006)2262 2978 y Fs(\003)2340 3014 y Fr(for)i(any)g(alphab)-5 b(et)37 b Fu(\006)h Fr(and)f(the)257 3135 y(languages)d(with)h(syntactic)g (monoids)e(in)i Fo(H)p Fr(.)404 3341 y Fx(As)29 b(a)f(corollary)-8 b(,)28 b(it)g(can)h(b)s(e)f(inferred)h(that)f(the)i(pseudo-v)-5 b(ariet)m(y)29 b Fo(DO)14 b Fq(\\)p 3075 3260 147 4 v 14 w Fo(Ab)29 b Fx(corre-)257 3461 y(sp)s(onds)35 b(to)e(the)h (smallest)d(language)i(v)-5 b(ariet)m(y)33 b(con)m(taining)f(the)i (languages)e(with)h(com-)257 3582 y(m)m(utativ)m(e)45 b(syn)m(tactic)h(monoids)e(and)h(closed)h(under)g(p)s(erfectly)f(unam)m (biguous)f(con-)257 3702 y(catenations.)404 3823 y(P)m(erfectly)37 b(unam)m(biguous)g(concatenations)f(are)h(a)g(sp)s(ecial)f(case)h(of)g (a)f(more)g(gen-)257 3944 y(eral)c(construction.)45 b(F)-8 b(or)32 b(languages)g Fv(K)1748 3959 y Fw(0)1788 3944 y Fv(;)17 b(:)g(:)g(:)f(;)h(K)2090 3959 y Ft(t)2147 3944 y Fq(\022)29 b Fu(\006)2323 3907 y Fs(\003)2396 3944 y Fx(and)k(letters)g Fv(a)2936 3959 y Fw(1)2975 3944 y Fv(;)17 b(:)g(:)g(:)f(;)h(a)3245 3959 y Ft(t)3303 3944 y Fq(2)29 b Fu(\006)p Fx(,)257 4064 y(w)m(e)40 b(denote)f(as)853 3983 y Fk(\000)1108 4020 y Ft(w)899 4098 y(K)959 4107 y Fj(0)993 4098 y Ft(a)1030 4107 y Fj(1)1065 4098 y Ft(K)1125 4107 y Fj(1)1159 4098 y Ft(:::)o(a)1255 4106 y Fi(t)1283 4098 y Ft(K)1343 4106 y Fi(t)1371 3983 y Fk(\001)1455 4064 y Fx(the)g(n)m(um)m(b)s(er)g(of)f(distinct)g(w)m(a)m(ys)i(in)e (whic)m(h)h(the)g(w)m(ord)257 4184 y Fv(w)44 b Fq(2)d Fu(\006)548 4148 y Fs(\003)628 4184 y Fx(can)g(b)s(e)g(factorized)e(as) i Fv(w)i Fu(=)e Fv(w)1838 4199 y Fw(0)1877 4184 y Fv(a)1928 4199 y Fw(1)1985 4184 y Fv(:)17 b(:)g(:)f(a)2167 4199 y Ft(t)2197 4184 y Fv(w)2267 4199 y Ft(t)2336 4184 y Fx(with)40 b Fv(w)2636 4199 y Ft(i)2705 4184 y Fq(2)2813 4199 y Ft(i)2841 4184 y Fx(.)67 b(The)41 b(concate-)257 4305 y(nation)d Fv(K)650 4320 y Fw(0)689 4305 y Fv(a)740 4320 y Fw(1)780 4305 y Fv(K)863 4320 y Fw(1)919 4305 y Fv(:)17 b(:)g(:)f(a)1101 4320 y Ft(t)1131 4305 y Fv(K)1214 4320 y Ft(t)1282 4305 y Fx(is)39 b(said)f(to)g(b)s(e)h Fr(unambiguous)f Fx(if)g(for)g(all)f Fv(w)k Fx(it)d(holds)g(that)257 4344 y Fk(\000)513 4381 y Ft(w)303 4459 y(K)363 4468 y Fj(0)397 4459 y Ft(a)434 4468 y Fj(1)469 4459 y Ft(K)529 4468 y Fj(1)563 4459 y Ft(:::)o(a)659 4467 y Fi(t)688 4459 y Ft(K)748 4467 y Fi(t)775 4344 y Fk(\001)865 4425 y Fx(is)44 b Fu(0)g Fx(or)g Fu(1)p Fx(.)79 b(F)-8 b(or)44 b(an)m(y)h(v)-5 b(ariet)m(y)45 b Fq(V)52 b Fx(of)44 b(languages)g(the)h Fr(unambiguous)257 4545 y(p)-5 b(olynomial)47 b(closur)-5 b(e)48 b(of)g Fq(V)8 b Fx(,)51 b(denoted)d Fu(\()p Fq(V)8 b Fu(\))p Fx(,)51 b(is)c(the)g(v)-5 b(ariet)m(y)47 b(generated)h(b)m(y) g(unam-)257 4666 y(biguous)42 b(concatenations)f(of)g(languages)g(in)g Fq(V)8 b Fx(.)71 b(Similarly)-8 b(,)39 b(for)i(an)m(y)i(prime)d Fv(p)p Fx(,)k(the)257 4786 y(Mo)s(d)452 4801 y Ft(p)536 4786 y Fr(p)-5 b(olynomial)43 b(closur)-5 b(e)45 b(of)g Fq(V)8 b Fx(,)46 b(denoted)f Fu(Mo)s(d)2216 4801 y Ft(p)2256 4786 y Fu(P)m(ol\()p Fq(V)8 b Fu(\))p Fx(,)47 b(is)c(the)h(v)-5 b(ariet)m(y)43 b(gener-)257 4907 y(ated)36 b(b)m(y)g(languages)e(of)h (the)g(form)f Fq(f)p Fv(w)h Fu(:)1793 4826 y Fk(\000)2048 4862 y Ft(w)1839 4941 y(K)1899 4950 y Fj(0)1933 4941 y Ft(a)1970 4950 y Fj(1)2005 4941 y Ft(K)2065 4950 y Fj(1)2099 4941 y Ft(:::)o(a)2195 4949 y Fi(t)2223 4941 y Ft(K)2283 4949 y Fi(t)2311 4826 y Fk(\001)2388 4907 y Fq(\021)e Fv(i)44 b Fu(\(mo)s(d)34 b Fv(p)p Fu(\))p Fq(g)g Fx(for)h Fv(K)3240 4922 y Ft(i)3300 4907 y Fq(2)e(V)8 b Fx(.)257 5027 y(While)27 b(the)h(op)s(erators)f Fu(UP)m(ol)h Fx(and)g Fu(Mo)s(d)1746 5042 y Ft(p)1786 5027 y Fu(P)m(ol)g Fx(are)g(de\034ned)h(on)e(v)-5 b(arieties)27 b(of)g(languages,)257 5147 y(they)50 b(ha)m(v)m(e)g(an)e(algebraic)f(coun)m(terpart)i (de\034ned)h(in)d(terms)i(of)f(so-called)f(Mal'cev)257 5268 y(pro)s(ducts)c(of)e(pseudo-v)-5 b(arieties)42 b(\(see)h([)1741 5268 y SDict begin H.S end 1741 5268 a Fx(46)1839 5204 y SDict begin H.R end 1839 5204 a 1839 5268 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Pin97) cvn H.B /ANN pdfmark end 1839 5268 a Fx(]\):)62 b(if)41 b Fo(V)i Fx(denotes)g(the)f (pseudo-v)-5 b(ariet)m(y)43 b(of)257 5388 y(monoids)52 b(corresp)s(onding)g(to)h Fq(V)8 b Fx(,)58 b(then)53 b(the)h(pseudo-v)-5 b(arieties)52 b(corresp)s(onding)h(to)p eop end %%Page: 7 7 TeXDict begin 7 6 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.7) cvn H.B /DEST pdfmark end 257 266 a 307 x Fu(UP)m(ol)q(\()p Fq(V)8 b Fu(\))34 b Fx(and)g Fu(Mo)s(d)1035 588 y Ft(p)1075 573 y Fu(P)m(ol\()p Fq(V)8 b Fu(\))34 b Fx(are)g(resp)s(ectiv)m(ely)h Fo(LI)17 b Fq(\015)-87 b Fh(m)29 b Fo(V)35 b Fx(and)f Fo(LG)2799 588 y Fl(p)2865 573 y Fq(\015)-87 b Fh(m)30 b Fo(V)35 b Fx(where)g Fo(LI)257 693 y Fx(and)42 b Fo(LG)611 708 y Fl(p)701 693 y Fx(resp)s(ectiv)m(ely)g(denote)g(the)g(classes)g (of)e(lo)s(cally)f(trivial)f(monoids)i(and)h(lo-)257 814 y(cal)f Fv(p)p Fx(-groups)g([)848 814 y SDict begin H.S end 848 814 a Fx(48)946 749 y SDict begin H.R end 946 749 a 946 814 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.PinW97) cvn H.B /ANN pdfmark end 946 814 a Fx(,)1014 814 y SDict begin H.S end 1014 814 a Fx(71)1111 749 y SDict begin H.R end 1111 749 a 1111 814 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Weil92) cvn H.B /ANN pdfmark end 1111 814 a Fx(].)68 b(While)39 b(a)h(tec)m(hnical)g(discussion)h(of)f (the)h(Mal'cev)g(pro)s(duct)257 934 y(w)m(ould)30 b(b)s(e)g(tedious,)h (w)m(e)g(simply)d(men)m(tion)h(that)h(giv)m(en)f(a)h(list)f(of)g(iden)m (tities)g(de\034ning)g(a)257 1054 y(pseudo-v)-5 b(ariet)m(y)32 b Fo(V)f Fx(it)f(is)g(often)h(p)s(ossible)f(to)g(deriv)m(e)i(a)e(list)f (of)i(iden)m(tities)e(de\034ning)i(the)257 1175 y(t)m(w)m(o)42 b(pseudo-v)-5 b(arieties)40 b(ab)s(o)m(v)m(e)i([)1478 1175 y SDict begin H.S end 1478 1175 a Fx(47)1576 1111 y SDict begin H.R end 1576 1111 a 1576 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.PinW96) cvn H.B /ANN pdfmark end 1576 1175 a Fx(,)1644 1175 y SDict begin H.S end 1644 1175 a Fx(48)1741 1111 y SDict begin H.R end 1741 1111 a 1741 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.PinW97) cvn H.B /ANN pdfmark end 1741 1175 a Fx(,)1809 1175 y SDict begin H.S end 1809 1175 a Fx(71)1906 1111 y SDict begin H.R end 1906 1111 a 1906 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Weil92) cvn H.B /ANN pdfmark end 1906 1175 a Fx(].)69 b(In)41 b(particular)e(the)i(follo)m(wing)d (lemma)257 1295 y(can)33 b(b)s(e)g(obtained.)257 1295 y SDict begin H.S end 257 1295 a 257 1295 a SDict begin 14.5 H.A end 257 1295 a 257 1295 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.4) cvn H.B /DEST pdfmark end 257 1295 a 154 x Fn(Lemma)k(4)h(\([)823 1449 y SDict begin H.S end 823 1449 a Fn(65)935 1384 y SDict begin H.R end 935 1384 a 935 1449 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT05) cvn H.B /ANN pdfmark end 935 1449 a Fn(]\).)j Fr(A)35 b(monoid)f(do)-5 b(es)34 b(not)h(b)-5 b(elong)34 b(to)h Fo(LG)2490 1464 y Fl(p)2556 1449 y Fq(\015)-87 b Fh(m)30 b Fo(Com)35 b Fr(if)g(and)f(only)h(if)403 1603 y Fq(\017)48 b Fv(M)e Fr(is)34 b(divide)-5 b(d)34 b(by)h(the)g(syntactic)g(monoid)e (of)i Fu(\()p Fv(ab)p Fu(\))2405 1566 y Fs(\003)2445 1603 y Fr(;)g(or)403 1789 y Fq(\017)48 b Fv(M)e Fr(is)34 b(divide)-5 b(d)34 b(by)h(the)g(syntactic)g(monoid)e(of)i Fq(f)p Fv(a;)17 b(b)p Fq(g)2473 1753 y Fs(\003)2512 1789 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)2850 1753 y Fs(\003)2890 1789 y Fr(;)35 b(or)403 1976 y Fq(\017)48 b Fv(M)e Fr(is)34 b(a)h Fv(T)887 1991 y Ft(q)925 1976 y Fr(-monoid)f(for)g(some)g Fv(q)e Fq(\025)c Fu(2)35 b Fr(which)f(is)g(not)h(a)g(p)-5 b(ower)34 b(of)g Fv(p)p Fr(;)h(or)403 2163 y Fq(\017)48 b Fr(or)40 b Fv(M)51 b Fr(c)-5 b(ontains)40 b(a)g(sub)-5 b(gr)g(oup)40 b Fv(H)48 b Fr(whose)39 b(c)-5 b(ommutator)40 b(sub)-5 b(gr)g(oup)40 b(is)g(not)g(a)g Fv(p)p Fr(-)501 2284 y(gr)-5 b(oup.)404 2437 y Fx(This)42 b(lemma)f(pro)m(vides)i(us)g (with)f(an)g(excellen)m(t)h(understanding)g(of)f(the)h Fu(Mo)s(d)3423 2452 y Ft(p)3463 2437 y Fx(-)257 2558 y(closure)36 b(of)g(comm)m(utativ)m(e)f(languages.)52 b(The)37 b(unam)m(biguous)e(p)s(olynomial)e(closure)j(of)257 2678 y(these)k(languages)e(in)f(fact)h(corresp)s(onds)i(to)e(the)h (pseudo-v)-5 b(ariet)m(y)39 b Fo(DO)26 b Fq(\\)p 3063 2597 147 4 v 26 w Fo(Ab)39 b Fx(whic)m(h)257 2798 y(w)m(e)34 b(discussed)g(earlier.)257 2940 y SDict begin H.S end 257 2940 a 257 2940 a SDict begin 14.5 H.A end 257 2940 a 257 2940 a SDict begin [ /View [/XYZ H.V] /Dest (section.3) cvn H.B /DEST pdfmark end 257 2940 a 183 x Fy(3)156 b(Comm)l(unication)52 b(Complexit)l(y)257 3342 y Fx(Comm)m(unication)27 b(complexit)m(y)i (measures)h(the)g(amoun)m(t)f(of)g(information)d(that)j(t)m(w)m(o)i(or) 257 3462 y(more)d(pro)s(cessors)i(need)g(to)e(exc)m(hange)j(when)f (computing)d(a)h(function)h(on)f(some)h(input)257 3582 y(distributed)38 b(among)f(them.)61 b(It)39 b(w)m(as)g(\034rst)g(in)m (tro)s(duced)g(b)m(y)g(Y)-8 b(ao)38 b([)2762 3582 y SDict begin H.S end 2762 3582 a Fx(72)2860 3518 y SDict begin H.R end 2860 3518 a 2860 3582 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Yao79) cvn H.B /ANN pdfmark end 2860 3582 a Fx(])g(in)g(relation)f(to)257 3703 y(distributed)i(computing)f (but)i(it)f(has)h(b)s(ecome)f(one)h(of)f(the)h(most)f(ubiquitous)g(to)s (ols)257 3823 y(of)d(theoretical)g(computer)g(science)i(with)e(imp)s (ortan)m(t)e(connections)j(to)f(VLSI)h(design)257 3944 y(\(see)32 b([)478 3944 y SDict begin H.S end 478 3944 a Fx(40)575 3879 y SDict begin H.R end 575 3879 a 575 3944 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KN97) cvn H.B /ANN pdfmark end 575 3944 a Fx(]\),)f(branc)m(hing)f(program)f (complexit)m(y)h([)2057 3944 y SDict begin H.S end 2057 3944 a Fx(70)2154 3879 y SDict begin H.R end 2154 3879 a 2154 3944 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Wegener) cvn H.B /ANN pdfmark end 2154 3944 a Fx(],)h(circuit)e(complexit) m(y)h([)3061 3944 y SDict begin H.S end 3061 3944 a Fx(28)3158 3879 y SDict begin H.R end 3158 3879 a 3158 3944 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Grolmusz92) cvn H.B /ANN pdfmark end 3158 3944 a Fx(,)3216 3944 y SDict begin H.S end 3216 3944 a Fx(29)3313 3879 y SDict begin H.R end 3313 3879 a 3313 3944 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Grolmusz94b) cvn H.B /ANN pdfmark end 3313 3944 a Fx(,)3371 3944 y SDict begin H.S end 3371 3944 a Fx(32)3468 3879 y SDict begin H.R end 3468 3879 a 3468 3944 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.HastadG90) cvn H.B /ANN pdfmark end 3468 3944 a Fx(,)257 4064 y SDict begin H.S end 257 4064 a Fx(43)355 4000 y SDict begin H.R end 355 4000 a 355 4064 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Nisan94) cvn H.B /ANN pdfmark end 355 4064 a Fx(,)409 4064 y SDict begin H.S end 409 4064 a Fx(51)507 4000 y SDict begin H.R end 507 4000 a 507 4064 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.RazM97) cvn H.B /ANN pdfmark end 507 4064 a Fx(],)f(time-space)d(tradeo\033s)i(for)f(T)-8 b(uring)27 b(mac)m(hines)g([)2359 4064 y SDict begin H.S end 2359 4064 a Fx(6)2408 4000 y SDict begin H.R end 2408 4000 a 2408 4064 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BabaiNS92) cvn H.B /ANN pdfmark end 2408 4064 a Fx(],)i(data)e(structures)i([)3186 4064 y SDict begin H.S end 3186 4064 a Fx(40)3284 4000 y SDict begin H.R end 3284 4000 a 3284 4064 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KN97) cvn H.B /ANN pdfmark end 3284 4064 a Fx(])e(and)257 4184 y(pro)s(of)e(complexit)m(y)f([)1020 4184 y SDict begin H.S end 1020 4184 a Fx(13)1118 4120 y SDict begin H.R end 1118 4120 a 1118 4184 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BeamePS05) cvn H.B /ANN pdfmark end 1118 4184 a Fx(].)41 b(The)26 b(monograph)e(of)g(Kushilevitz)h (and)g(Nisan)g([)2993 4184 y SDict begin H.S end 2993 4184 a Fx(40)3090 4120 y SDict begin H.R end 3090 4120 a 3090 4184 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KN97) cvn H.B /ANN pdfmark end 3090 4184 a Fx(])h(pro)m(vides)257 4305 y(a)33 b(v)m(ery)h(go)s(o)s(d)d(o)m(v)m(erview)j(of)e(the)h (\034rst)g(\034fteen)g(y)m(ears)h(of)e(researc)m(h)i(on)f(the)g(sub)5 b(ject.)404 4425 y(In)53 b(a)f(\(v)m(ery)i(en)m(tertaining\))e(pap)s (er)h([)1843 4425 y SDict begin H.S end 1843 4425 a Fx(5)1892 4361 y SDict begin H.R end 1892 4361 a 1892 4425 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BabaiFS86) cvn H.B /ANN pdfmark end 1892 4425 a Fx(],)k(Babai,)g(F)-8 b(rankl)52 b(and)h(Simon)e(de\034ned)257 4545 y(comm)m(unication)26 b(complexit)m(y)h(analogues)h(of)f(the)i(standard)f(time/space)g (complexit)m(y)257 4666 y(classes)f(P)-8 b(,)25 b(NP)-8 b(,)26 b(RP)-8 b(,)25 b Fq(\010)p Fx(P)-8 b(,)26 b(PSP)-8 b(A)m(CE)28 b(and)d(so)h(on)f(and)g(considered)h(a)f(natural)f(notion)h (of)257 4786 y(reduction)h(in)f(the)i(comm)m(unication)c(con)m(text)k (under)g(whic)m(h)f(classes)h(lik)m(e)e(NP)-8 b(,)26 b Fq(\010)p Fx(P)h(and)257 4907 y(PSP)-8 b(A)m(CE)40 b(ha)m(v)m(e)f(complete)d(problems.)58 b(This)38 b(pro)m(vides,)h(on)f (one)g(hand,)h(a)e(p)s(o)m(w)m(erful)257 5027 y(framew)m(ork)42 b(to)f(compare)g(the)h(p)s(o)m(w)m(er)g(of)f(v)-5 b(arious)41 b(extensions)i(of)e(the)h(usual)f(deter-)257 5147 y(ministic)31 b(mo)s(del)h(while)g(building,)f(on)i(the)h(other)f(hand,)h(a)f(ric)m (h)g(structure)i(of)d(classes)257 5268 y(in)37 b(whic)m(h)h(one)f(can)h (hop)s(e)f(to)g(gain)f(in)m(tuition)f(on)i(the)h(nature)g(of)e (non-determinism,)257 5388 y(alternation,)31 b(randomization)f(and)i (so)h(on.)p eop end %%Page: 8 8 TeXDict begin 8 7 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.8) cvn H.B /DEST pdfmark end 257 266 a 257 473 a SDict begin H.S end 257 473 a 257 473 a SDict begin 14.5 H.A end 257 473 a 257 473 a SDict begin [ /View [/XYZ H.V] /Dest (subsection.3.1) cvn H.B /DEST pdfmark end 257 473 a 100 x Fg(3.1)131 b(T)-11 b(w)l(o-P)l(art)l(y)45 b(Mo)t(dels)257 759 y Fx(In)31 b(the)h(simplest)d(mo)s(del,)h(t)m(w)m(o)h(parties)f(\(Alice)g (and)h(Bob\))g(collab)s(orate)d(to)i(ev)-5 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y(functions)c Fv(A;)17 b(B)32 b Fu(:)c(\006)1029 1562 y Ft(n)1104 1598 y Fq(!)f Fu(\000)1292 1562 y Ft(t)p Fw(\()p Ft(n)p Fw(\))1455 1598 y Fr(such)34 b(that)h Fv(f)11 b Fu(\()p Fv(x;)17 b(y)t Fu(\))27 b(=)h Fv(g)t Fu(\()p Fv(A)p Fu(\()p Fv(x)p Fu(\))p Fv(;)17 b(B)5 b Fu(\()p Fv(y)t Fu(\)\))p Fr(.)404 1810 y Fx(These)27 b(reductions)e(are)h(v)m(ery)g(natural)e(in)h(a)g (comm)m(unication)e(complexit)m(y)h(con)m(text)257 1930 y(since)40 b(the)g(functions)g Fv(A)g Fx(and)g Fv(B)k Fx(can)c(b)s(e)g(computed)g(priv)-5 b(ately)38 b(b)m(y)j(Alice)d(and)i (Bob)257 2051 y(resp)s(ectiv)m(ely)-8 b(.)44 b(Hence,)34 b(if)d(there)h(is)g(a)g(rectangular)f(reduction)h(of)f(length)h Fv(t)p Fu(\()p Fv(n)p Fu(\))g Fx(from)f Fv(f)257 2171 y Fx(to)i Fv(g)i Fx(then)f Fv(D)s Fu(\()p Fv(g)t Fu(\)\()p Fv(t)p Fu(\()p Fv(n)p Fu(\)\))26 b Fq(\025)i Fv(D)s Fu(\()p Fv(f)11 b Fu(\)\()p Fv(n)p Fu(\))p Fx(.)404 2293 y(If)44 b Fv(f)54 b Fx(is)44 b(a)g(function)f(of)g(t)m(w)m(o)i(strings)f Fv(x;)17 b(y)47 b 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Fx(sup)s(erscript)h(for)e(\020con)m(v)m(enience)j(and)e(added)g (thrill\021)36 b(and)31 b(de\034ne)257 3136 y(NP)26 b(and)f(Mo)s(d)799 3151 y Ft(p)839 3136 y Fx(P)g(as)g(the)h(class)f(of)f(languages)h (with,)h(resp)s(ectiv)m(ely)-8 b(,)27 b(non-deterministic)257 3256 y(and)35 b(Mo)s(d)644 3271 y Ft(p)684 3256 y Fx(-coun)m(ting)f (comm)m(unication)f(complexit)m(y)h Fv(O)s Fu(\(log)2539 3213 y Ft(d)2596 3256 y Fv(n)p Fu(\))p Fx(.)51 b(There)36 b(are)f(in)f(fact)257 3377 y(natural)45 b(complete)g(problems)g(for)h (NP)g(and)g(Mo)s(d)2214 3392 y Ft(p)2254 3377 y Fx(P)-8 b(.)46 b(F)-8 b(or)45 b Fv(n)p Fx(-bit)g(strings)h Fv(x;)17 b(y)t Fx(,)48 b(w)m(e)257 3497 y(de\034ne)36 b(the)f(disjoin)m(tness)g (function)f(as)h Fv(D)s(I)8 b(S)e(J)j Fu(\()p Fv(x;)17 b(y)t Fu(\))30 b(=)h(1)j Fx(if)f Fv(x)2598 3512 y Ft(i)2627 3497 y Fv(y)2675 3512 y Ft(i)2734 3497 y Fu(=)e(0)j Fx(for)g Fu(1)d Fq(\024)h Fv(i)f Fq(\024)h Fv(n)257 3617 y Fx(and)j(the)g(inner) g(pro)s(duct)g(mo)s(dulo)e Fv(p)h Fx(as)h Fv(I)8 b(P)1910 3632 y Ft(p)1950 3617 y Fu(\()p Fv(x;)17 b(y)t Fu(\))30 b(=)i(1)i Fx(if)2490 3543 y Fk(P)2595 3569 y Ft(n)2595 3647 y(i)p Fw(=1)2730 3617 y Fv(x)2785 3632 y Ft(i)2814 3617 y Fv(y)2862 3632 y Ft(i)2921 3617 y Fq(\021)e Fu(0)44 b(\(mo)s(d)33 b Fv(p)p Fu(\))p Fx(.)257 3738 y(If)e(w)m(e)i(view)e Fv(x;)17 b(y)34 b Fx(as)e(enco)s(ding)f(subsets)i(of)d Fq(f)p Fu(1)p Fv(;)17 b(:)g(:)g(:)f(;)h(n)p Fq(g)31 b Fx(then)g Fv(D)s(I)8 b(S)e(J)j Fu(\()p Fv(x;)17 b(y)t Fu(\))27 b(=)g(1)k Fx(if)f(and)257 3858 y(only)i(if)g Fv(x)22 b Fq(\\)h Fv(y)31 b Fu(=)c Fq(;)33 b Fx(and)f Fv(I)8 b(P)1295 3873 y Ft(p)1335 3858 y Fu(\()p Fv(x;)17 b(y)t Fu(\))26 b(=)i(1)k Fx(if)g(and)g(only)g(if)g Fq(j)p Fv(x)22 b Fq(\\)h Fv(y)t Fq(j)31 b Fx(is)h(divisible)e(b)m(y)k Fv(p)p Fx(.)257 3886 y SDict begin H.S end 257 3886 a 257 3886 a SDict begin 14.5 H.A end 257 3886 a 257 3886 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.6) cvn H.B /DEST pdfmark end 257 3886 a 184 x Fn(Theorem)51 b(6)h(\([)929 4070 y SDict begin H.S end 929 4070 a Fn(5)984 4005 y SDict begin H.R end 984 4005 a 984 4070 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BabaiFS86) cvn H.B /ANN pdfmark end 984 4070 a Fn(,)1067 4070 y SDict begin H.S end 1067 4070 a Fn(22)1179 4005 y SDict begin H.R end 1179 4005 a 1179 4070 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.DKMW) cvn H.B /ANN pdfmark end 1179 4070 a Fn(]\).)c Fr(The)d(c)-5 b(omplement)44 b(of)i Fv(D)s(I)8 b(S)e(J)55 b Fr(is)46 b Fv(N)10 b(P)k Fr(-c)-5 b(omplete)44 b(under)257 4200 y(r)-5 b(e)g(ctangular)35 b(r)-5 b(e)g(ductions)34 b(of)h(length)f Fv(O)s Fu(\(2)1793 4163 y Fw(log)1883 4138 y Fi(d)1931 4163 y Ft(n)1978 4200 y Fu(\))p Fr(.)257 4320 y(F)-7 b(or)46 b(any)h(prime)f Fv(p)p Fr(,)j Fv(I)8 b(P)1184 4335 y Ft(p)1270 4320 y Fr(is)47 b(Mo)-5 b(d)1569 4335 y Ft(p)1608 4320 y Fv(P)14 b Fr(-c)-5 b(omplete)45 b(under)i(r)-5 b(e)g(ctangular)46 b(r)-5 b(e)g(ductions)47 b(of)257 4452 y(length)35 b Fv(O)s Fu(\(2)709 4416 y Fw(log)799 4391 y Fi(d)847 4416 y Ft(n)894 4452 y Fu(\))p Fr(.)404 4664 y Fx(It)26 b(is)h(not)f(hard)h(to)f(sho)m(w)i(that)e Fv(D)s Fu(\()p Fv(D)s(I)8 b(S)e(J)j Fu(\))27 b(=)h(\002\()p Fv(n)p Fu(\))e Fx(and)h(so)g(P)g Fq(6)p Fu(=)f Fx(NP)i(in)d(the)j(w)m (orld)257 4785 y(of)40 b(comm)m(unication)d(complexit)m(y)-8 b(.)64 b(F)-8 b(urthermore)39 b(one)h(can)h(sho)m(w)f(that)g Fv(N)3110 4748 y Fw(1)3150 4785 y Fu(\()p Fv(I)8 b(P)3302 4800 y Ft(p)3341 4785 y Fu(\))40 b(=)257 4905 y(\002\()p Fv(n)p Fu(\))33 b Fx(and,)f(for)g(an)m(y)i(prime)d Fv(p)p Fx(,)h Fv(N)1522 4869 y Ft(p)1563 4905 y Fu(\()p Fv(D)s(I)8 b(S)e(J)j Fu(\))27 b(=)g(\002\()p Fv(n)p Fu(\))33 b Fx(and)f Fv(N)2553 4869 y Ft(p)2593 4905 y Fu(\()p Fv(I)8 b(P)2745 4920 y Ft(q)2783 4905 y Fu(\))28 b(=)f(\002\()p Fv(n)p Fu(\))33 b Fx(for)f(an)m(y)257 5025 y Fv(q)38 b Fx(not)c(a)f(p)s(o)m(w) m(er)i(of)f Fv(p)p Fx(.)47 b(So)34 b(the)g(classes)h(NP)g(and)f(Mo)s(d) 2295 5040 y Ft(p)2334 5025 y Fx(P)h(are)e(all)f(incomparable)g(and)257 5146 y(distinct)g(from)f(P)i([)966 5146 y SDict begin H.S end 966 5146 a Fx(22)1064 5081 y SDict begin H.R end 1064 5081 a 1064 5146 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.DKMW) cvn H.B /ANN pdfmark end 1064 5146 a Fx(].)404 5268 y(Strictly)c(sp)s(eaking,)i Fv(D)s(I)8 b(S)e(J)39 b Fx(and)31 b Fv(I)8 b(P)1774 5283 y Ft(q)1842 5268 y Fx(are)30 b(not)h(regular)e(languages)h(but)h(it)e(is)h(easy)257 5388 y(to)46 b(see)h(that)f(they)h(are)f(closely)g(related)f(to)h(the)h (regular)e(languages)g Fq(f)p Fu(00)p Fv(;)17 b Fu(01)p Fv(;)g Fu(10)p Fq(g)3458 5352 y Fs(\003)p eop end %%Page: 10 10 TeXDict begin 10 9 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.10) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(and)28 b Fu(\(\()p Fq(f)p Fu(00)p Fv(;)17 b Fu(01)p Fv(;)g Fu(10)p Fq(g)1000 537 y Fs(\003)1037 573 y Fu(11)p Fq(f)p Fu(00)p Fv(;)g Fu(01)p Fv(;)g Fu(10)p Fq(g)1617 537 y Fs(\003)1654 573 y Fu(\))1692 537 y Ft(q)1730 573 y Fu(\))1768 537 y Fs(\003)1835 573 y Fx(resp)s(ectiv)m(ely)-8 b(.)43 b(T)-8 b(o)28 b(further)g(explore)g(the)g(rel-)257 693 y(ev)-5 b(ance)46 b(of)e(regular)f(languages)h(in)f(this)h(con)m(text,) 49 b(w)m(e)c(de\034ne)h(the)f(comm)m(unication)257 814 y(complexit)m(y)29 b(of)f(a)h(regular)f(language)f(as)j(the)f (complexit)m(y)f(of)h(the)g(follo)m(wing)d(task:)43 b(Al-)257 934 y(ice)24 b(and)g(Bob)g(resp)s(ectiv)m(ely)h(receiv)m(e)g Fv(a)1657 949 y Fw(1)1697 934 y Fv(;)17 b(a)1792 949 y Fw(3)1831 934 y Fv(;)g(:)g(:)g(:)f(a)2057 949 y Fw(2)p Ft(n)p Fs(\000)p Fw(1)2253 934 y Fx(and)24 b Fv(a)2485 949 y Fw(2)2525 934 y Fv(;)17 b(a)2620 949 y Fw(4)2659 934 y Fv(;)g(:)g(:)g(:)f(;)h(a)2929 949 y Fw(2)p Ft(n)3035 934 y Fx(where)25 b(eac)m(h)257 1054 y Fv(a)308 1069 y Ft(i)366 1054 y Fx(is)k(either)g(an)g(elemen)m(t)g(of)f(the)i (\034nite)f(alphab)s(et)f Fu(\006)i Fx(or)f(the)g(empt)m(y)h(w)m(ord)f Fv(\017)h Fx(and)f(they)257 1175 y(w)m(an)m(t)35 b(to)e(determine)g (whether)h Fv(a)1498 1190 y Fw(1)1538 1175 y Fv(a)1589 1190 y Fw(2)1645 1175 y Fv(:)17 b(:)g(:)f(a)1827 1190 y Fw(2)p Ft(n)1943 1175 y Fx(b)s(elongs)33 b(to)g Fv(L)p Fx(.)46 b(Similarly)-8 b(,)30 b(the)k(comm)m(u-)257 1295 y(nication)h(complexit)m(y)g(of)g(a)h(\034nite)f(monoid)f Fv(M)47 b Fx(is)35 b(the)i(comm)m(unication)c(complexit)m(y)257 1416 y(of)42 b(ev)-5 b(aluating)40 b(in)h Fv(M)53 b Fx(the)42 b(pro)s(duct)h Fv(m)1764 1431 y Fw(1)1832 1416 y Fq(\001)28 b Fv(m)1973 1431 y Fw(2)2041 1416 y Fq(\001)h Fv(:)17 b(:)g(:)28 b Fq(\001)g Fv(m)2382 1431 y Fw(2)p Ft(n)2506 1416 y Fx(where)44 b(the)e(o)s(dd-indexed)257 1536 y Fv(m)342 1551 y Ft(i)399 1536 y Fq(2)28 b Fv(M)43 b Fx(are)32 b(kno)m(wn)i(to)e(Alice)f(and)i(the)g(ev)m(en-indexed)h Fv(m)2491 1551 y Ft(i)2552 1536 y Fx(are)e(kno)m(wn)i(to)e(Bob)g(\(w)m (e)257 1656 y(will)c(refer)i(to)g(this)g(task)g(as)g(the)h Fr(wor)-5 b(d)32 b(pr)-5 b(oblem)31 b(for)i Fv(M)10 b Fx(\).)43 b(The)31 b(next)g(lemma)d(pro)m(vides)257 1777 y(a)36 b(k)m(ey)i(to)s(ol)d(for)g(studying)i(the)g(comm)m(unication)c (complexit)m(y)j(of)g(regular)f(languages)257 1897 y(b)m(y)f(relating)c (the)j(complexit)m(y)f(of)g(a)g(language)g(with)g(its)g(syn)m(tactic)h (monoid.)257 1916 y SDict begin H.S end 257 1916 a 257 1916 a SDict begin 14.5 H.A end 257 1916 a 257 1916 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.7) cvn H.B /DEST pdfmark end 257 1916 a 189 x Fn(Lemma)48 b(7)g(\([)844 2105 y SDict begin H.S end 844 2105 a Fn(50)955 2040 y SDict begin H.R end 955 2040 a 955 2105 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.RaymondTT98) cvn H.B /ANN pdfmark end 955 2105 a Fn(]\).)e Fr(If)d Fv(L)h Fr(is)f(a)g(r)-5 b(e)g(gular)43 b(language)f(with)h(syntactic)g(monoid)f Fv(M)54 b Fu(=)257 2225 y Fv(M)10 b Fu(\()p Fv(L)p Fu(\))36 b Fr(then)f Fv(D)s Fu(\()p Fv(L)p Fu(\))28 b(=)f(\002\()p Fv(D)s Fu(\()p Fv(M)10 b Fu(\)\))35 b Fr(and)f Fv(N)1841 2189 y Ft(p)1881 2225 y Fu(\()p Fv(L)p Fu(\))28 b(=)g(\002\()p Fv(N)2357 2189 y Ft(p)2397 2225 y Fu(\()p Fv(M)10 b Fu(\)\))35 b Fr(for)g(any)g(prime)f Fv(p)p Fr(.)404 2433 y Fx(It)23 b(is)h(p)s(ossible)f(to)g(giv)m(e)h(a)f(complete)g(classi\034cation)f (result)i(for)f(the)h(comm)m(unication)257 2553 y(complexit)m(y)35 b(of)g(regular)f(languages)h(in)f(a)h(n)m(um)m(b)s(er)h(of)f(mo)s (dels.)50 b(In)36 b(order)f(to)g(discuss)257 2674 y(the)h(pro)s(of)e (of)h(the)g(next)i(theorem,)e(w)m(e)h(will)d(need)j(the)g(lo)m(w)m(er)f (b)s(ounds)h(stated)g(earlier)257 2794 y(ab)s(out)d(disjoin)m(tness)h (and)f(inner)g(pro)s(duct)g(as)h(w)m(ell)e(as)h(a)g(simple)f(lo)m(w)m (er)h(b)s(ound)h(ab)s(out)257 2914 y(the)e(function)e Fh(Grea)-8 b(ter)33 b(Than)c Fx(de\034ned)j(as)f Fv(GT)14 b Fu(\()p Fv(x;)j(y)t Fu(\))27 b(=)g(1)k Fx(i\033)f Fv(x)e Fq(\025)g Fv(y)t Fx(.)42 b(It)31 b(is)f(kno)m(wn)257 3035 y(that)j(the)g(deterministic)d(and)j(Mo)s(d)1607 3050 y Ft(p)1647 3035 y Fx(-coun)m(ting)e(complexit)m(y)h(of)g Fv(GT)46 b Fx(is)32 b Fu(\002\(log)18 b Fv(n)p Fu(\))p Fx(.)257 3063 y SDict begin H.S end 257 3063 a 257 3063 a SDict begin 14.5 H.A end 257 3063 a 257 3063 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.8) cvn H.B /DEST pdfmark end 257 3063 a 180 x Fn(Theorem)37 b(8.)42 b Fr([)891 3243 y SDict begin H.S end 891 3243 a Fr(65)990 3178 y SDict begin H.R end 990 3178 a 990 3243 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT05) cvn H.B /ANN pdfmark end 990 3243 a Fr(])35 b(L)-5 b(et)35 b Fv(L)28 b Fq(\022)h Fv(A)1496 3206 y Fs(\003)1570 3243 y Fr(b)-5 b(e)35 b(a)f(r)-5 b(e)g(gular)35 b(language)f(with)g Fv(M)39 b Fu(=)27 b Fv(M)10 b Fu(\()p Fv(L)p Fu(\))p Fr(.)46 b(Then)501 3605 y Fv(D)s Fu(\()p Fv(L)p Fu(\))28 b(=)858 3371 y Fk(8)858 3460 y(>)858 3490 y(<)858 3670 y(>)858 3699 y(:)947 3464 y Fv(O)s Fu(\(1\))284 b Fr(if)35 b(and)f(only)h(if)f Fv(M)46 b Fr(is)34 b(c)-5 b(ommutative;)947 3609 y Fu(\002\(log)17 b Fv(n)p Fu(\))100 b Fr(if)35 b(and)f(only)h(if)f Fv(M)46 b Fr(is)35 b(in)f Fo(DO)22 b Fq(\\)p 2634 3528 147 4 v 23 w Fo(Ab)35 b Fr(but)g(not)g(c)-5 b(ommutative;)947 3753 y Fu(\002\()p Fv(n)p Fu(\))277 b Fr(otherwise.)501 4136 y Fv(N)589 4100 y Ft(p)629 4136 y Fu(\()p Fv(L)p Fu(\))28 b(=)903 3842 y Fk(8)903 3932 y(>)903 3962 y(>)903 3992 y(>)903 4021 y(<)903 4201 y(>)903 4231 y(>)903 4261 y(>)903 4290 y(:)991 3947 y Fv(O)s Fu(\(1\))285 b Fr(if)34 b(and)g(only)h(if)g Fv(M)45 b Fr(is)35 b(c)-5 b(ommutative;)991 4092 y Fu(\002\(log)18 b Fv(n)p Fu(\))100 b Fr(if)31 b(and)g(only)g(if)g Fv(M)43 b Fr(is)31 b(in)g Fo(LG)2529 4107 y Fl(p)2595 4092 y Fq(\015)-87 b Fh(m)30 b Fo(Com)1444 4212 y Fr(but)35 b(is)g(not)f(c)-5 b(ommutative;)991 4333 y Fu(\002\()p Fv(n)p Fu(\))278 b Fr(otherwise.)404 4545 y Fn(Pro)s(of)25 b(sk)m(etc)m(h.)40 b Fx(W)-8 b(e)23 b(can)g(tak)m(e)g(adv)-5 b(an)m(tage)22 b(of)g(Lemma)2493 4545 y SDict begin H.S end 2493 4545 a Fx(7)2542 4480 y SDict begin H.R end 2542 4480 a 2542 4545 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.7) cvn H.B /ANN pdfmark end 2542 4545 a 22 w Fx(to)g(con)m(v)m(enien)m(tly)i(reason)257 4665 y(either)42 b(in)f(language-theoretic)e(or)j(algebraic)e(terms)h (and)h(all)d(these)k(classi\034cations)257 4785 y(fully)c(exploit)f (this)i(dualit)m(y)-8 b(.)63 b(The)41 b(upp)s(er)f(b)s(ounds)h(are)e(t) m(ypically)g(deriv)m(ed)h(through)257 4906 y(our)33 b(com)m(binatorial) 28 b(understanding)33 b(of)f(the)g(relev)-5 b(an)m(t)33 b(classes)g(of)f(regular)f(languages)257 5026 y(while)i(the)g (semigroup-theoretic)f(to)s(ols)g(are)h(most)g(crucial)f(to)h(obtain)f (the)h(matc)m(hing)257 5146 y(lo)m(w)m(er)g(b)s(ounds.)404 5268 y(F)-8 b(or)29 b(example,)h(it)e(is)i(quite)g(easy)h(to)e(see)i (that)f Fv(D)s Fu(\()p Fv(L)p Fu(\))d(=)h Fv(O)s Fu(\(1\))h Fx(if)f Fv(M)10 b Fu(\()p Fv(L)p Fu(\))31 b Fx(is)f(comm)m(u-)257 5388 y(tativ)m(e.)44 b(If)33 b(on)f(the)h(other)g(hand,)g Fv(M)44 b Fx(con)m(tains)32 b(elemen)m(ts)h Fv(a;)17 b(b)33 b Fx(that)g(do)f(not)h(comm)m(ute)p eop end %%Page: 11 11 TeXDict begin 11 10 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.11) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(then)37 b(there)f(is)g(an)g(ob)m(vious)g(exp)s(onen)m(tial)f(length)g (rectangular)g(reduction)h(from)f Fv(GT)257 693 y Fx(to)43 b(the)h(w)m(ord)f(problem)f(of)h Fv(M)10 b Fx(.)76 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2033 y Fx(if)257 2198 y(and)24 b(only)e(if)g Fv(I)8 b(P)836 2213 y Ft(m)903 2198 y Fu(\()p Fv(x;)17 b(y)t Fu(\))26 b(=)i(1)p Fx(.)40 b(Th)m(us,)27 b(in)22 b(all)f(mo)s(dels)h(considered,)k(the)e(comm)m (unication)257 2318 y(complexit)m(y)35 b(of)f Fv(G)h Fx(or)g(an)m(y)h(monoid)d(con)m(taining)h Fv(G)h Fx(m)m(ust)g(b)s(e)h (at)f(least)f(that)h(of)g Fv(I)8 b(P)3402 2333 y Ft(m)3468 2318 y Fx(.)257 2439 y(Note)31 b(that)f(for)g(a)g(prime)f Fv(p)p Fx(,)i(the)g(argumen)m(t)f(actually)e(sho)m(ws)k(that)f(there)g (exists)g(an)f Fv(m)257 2559 y Fx(not)36 b(a)f(p)s(o)m(w)m(er)i(of)e Fv(p)h Fx(suc)m(h)h(that)e Fv(I)8 b(P)1556 2574 y Ft(m)1658 2559 y Fx(reduces)38 b(to)d(the)h(w)m(ord)g(problem)f(for)g Fv(G)h Fx(as)f(long)257 2679 y(as)f Fu([)p Fv(G;)17 b(G)p Fu(])34 b Fx(is)f(not)h(a)g Fv(p)p Fx(-group.)47 b(This)34 b(fact)f(is)h(needed)h(for)e(the)i(linear)d(lo)m(w)m(er)i(b)s(ound)g (in)257 2800 y(the)f(Mo)s(d)620 2815 y Ft(p)660 2800 y Fx(-coun)m(ting)f(case.)404 2935 y(Using)43 b(the)i(same)f(t)m(yp)s (e)h(of)f(argumen)m(ts,)j(it)d(is)f(p)s(ossible)h(to)g(construct)h(a)f (linear)257 3056 y(length)32 b(reduction)h(from)e Fv(I)8 b(P)1333 3071 y Ft(q)1403 3056 y Fx(to)33 b(the)g(w)m(ord)g(problem)e (of)h(an)m(y)h Fv(T)2663 3071 y Ft(q)2701 3056 y Fx(-monoid.)404 3191 y(One)38 b(can)h(also)e(sho)m(w)i(that)f(there)h(is)f(a)g(length)f Fv(n)i Fx(reduction)f(from)f(Disjoin)m(tness)257 3311 y(to)g(the)h(comm)m(unication)c(problem)i(for)h(the)g(regular)g (language)e Fu(\()p Fv(ab)p Fu(\))2862 3275 y Fs(\003)2902 3311 y Fx(.)58 b(Once)38 b(again,)257 3432 y(on)29 b(input)f Fv(x;)17 b(y)32 b Fx(Alice)c(and)g(Bob)h(construct)h(for)e(eac)m(h)i (pair)d(of)h(bits)h Fv(x)2784 3447 y Ft(i)2812 3432 y Fv(;)17 b(y)2904 3447 y Ft(i)2960 3432 y Fx(of)29 b(the)g Fv(D)s(I)8 b(S)e(J)257 3552 y Fx(instance,)31 b(a)e(four-tuple)f Fv(s)1235 3567 y Fw(4)p Ft(i)p Fs(\000)p Fw(3)1405 3552 y Fv(:)17 b(:)g(:)f(s)1582 3567 y Fw(4)p Ft(i)1646 3552 y Fx(.)42 b(Alice)28 b(sets)j Fv(s)2192 3567 y Fw(4)p Ft(i)p Fs(\000)p Fw(3)2373 3552 y Fu(=)d Fv(a)h Fx(and)h Fv(s)2790 3567 y Fw(4)p Ft(i)p Fs(\000)p Fw(1)2971 3552 y Fu(=)e Fv(b)h Fx(if)g Fv(x)3287 3567 y Ft(i)3343 3552 y Fu(=)e(1)257 3673 y Fx(but)34 b Fv(s)483 3688 y Fw(4)p Ft(i)p Fs(\000)p Fw(3)666 3673 y Fu(=)28 b Fv(s)816 3688 y Fw(4)p Ft(i)p Fs(\000)p Fw(1)999 3673 y Fu(=)h Fv(\017)k Fx(when)i Fv(x)1487 3688 y Ft(i)1545 3673 y Fu(=)28 b(0)p Fx(.)46 b(Similarly)-8 b(,)29 b(Bob)34 b(sets)g Fv(s)2648 3688 y Fw(4)p Ft(i)p Fs(\000)p Fw(2)2831 3673 y Fu(=)29 b Fv(a)k Fx(and)g Fv(s)3256 3688 y Fw(4)p Ft(i)3349 3673 y Fu(=)c Fv(b)257 3793 y Fx(when)g Fv(y)555 3808 y Ft(i)611 3793 y Fu(=)e(1)g Fx(but)h Fv(s)1010 3808 y Fw(4)p Ft(i)p Fs(\000)p Fw(2)1192 3793 y Fu(=)f Fv(s)1341 3808 y Fw(4)p Ft(i)1432 3793 y Fu(=)h Fv(\017)g Fx(when)h Fv(y)1901 3808 y Ft(i)1956 3793 y Fu(=)e(0)p Fx(.)42 b(The)29 b(resulting)d (four-tuple)h(is)g Fv(aabb)257 3913 y Fx(if)38 b Fv(x)408 3928 y Ft(i)475 3913 y Fu(=)g Fv(y)637 3928 y Ft(i)703 3913 y Fu(=)h(1)f Fx(but)h(otherwise)h(is)e(one)h(of)g Fv(\017\017\017\017)p Fx(,)j Fv(\017a\017b\017)e Fx(and)f Fv(a\017b\017)p Fx(.)64 b(It)39 b(is)f(no)m(w)i(clear)257 4034 y(that)c(the)g(w)m(ord)g Fv(s)933 4049 y Fw(1)989 4034 y Fv(:)17 b(:)g(:)f(s)1166 4049 y Fw(4)p Ft(n)1284 4034 y Fx(b)s(elongs)36 b(to)f Fu(\()p Fv(ab)p Fu(\))1928 3998 y Fs(\003)2004 4034 y Fx(if)f(and)i(only)g(if)e Fv(D)s(I)8 b(S)e(J)j Fu(\()p Fv(x;)17 b(y)t Fu(\))32 b(=)h(1)p Fx(.)53 b(W)-8 b(e)257 4154 y(can)34 b(conclude)h(that)e Fv(D)s Fu(\(\()p Fv(ab)p Fu(\))1342 4118 y Fs(\003)1382 4154 y Fu(\))d(=)f(\012\()p Fv(n)p Fu(\))35 b Fx(and)f Fv(N)2073 4118 y Ft(p)2113 4154 y Fu(\(\()p Fv(ab)p Fu(\))2319 4118 y Fs(\003)2359 4154 y Fu(\))c(=)f(\012\()p Fv(n)p Fu(\))35 b Fx(for)e(eac)m(h)i(prime)d Fv(p)p Fx(.)257 4274 y(F)-8 b(urthermore,)40 b(these)h(lo)m(w)m(er)e(b)s(ounds)h(also)e (apply)g(to)h(an)m(y)h(monoid)d(divided)i(b)m(y)h(the)257 4395 y(syn)m(tactic)34 b(monoid)c(of)j Fu(\()p Fv(ab)p Fu(\))1296 4359 y Fs(\003)1336 4395 y Fx(.)404 4530 y(A)j(similar)c (argumen)m(t)j(pro)m(vides)i(a)e(linear)f(length)h(reduction)h(from)f (the)h(comple-)257 4651 y(men)m(t)41 b(of)g Fv(D)s(I)8 b(S)e(J)50 b Fx(to)40 b(the)i(comm)m(unication)c(problem)i(asso)s (ciated)h(with)g(the)g(regular)257 4771 y(language)31 b Fq(f)p Fv(a;)17 b(b)p Fq(g)899 4735 y Fs(\003)939 4771 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)1277 4735 y Fs(\003)1317 4771 y Fx(.)43 b(If)32 b(a)g(monoid)f Fv(M)43 b Fx(is)32 b(not)g(in)g Fo(DO)21 b Fq(\\)p 2713 4690 147 4 v 22 w Fo(Ab)32 b Fx(then)h(either)f Fv(M)257 4891 y Fx(is)g(a)g Fv(T)493 4906 y Ft(p)533 4891 y Fx(-monoid)e(or)i(it)f(con)m(tains)i(a) f(non-Ab)s(elian)e(subgroup)j(or)f(it)f(is)h(divided)g(b)m(y)h(the)257 5012 y(syn)m(tactic)f(monoid)c(of)i(either)h Fu(\()p Fv(ab)p Fu(\))1564 4976 y Fs(\003)1634 5012 y Fx(or)f Fq(f)p Fv(a;)17 b(b)p Fq(g)1987 4976 y Fs(\003)2027 5012 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)2365 4976 y Fs(\003)2405 5012 y Fx(.)42 b(In)31 b(the)g(\034rst)g(t)m(w)m(o)g(cases)h(w)m(e)257 5132 y(obtain)26 b(the)h(required)f(lo)m(w)m(er)h(b)s(ound)g(for)e Fv(D)s Fu(\()p Fv(M)10 b Fu(\))27 b Fx(through)g(a)f(reduction)g(from)f Fv(I)8 b(P)3272 5147 y Ft(p)3338 5132 y Fx(and)257 5253 y(in)32 b(the)h(last)f(t)m(w)m(o)h(cases)h(through)e(a)h(reduction)f (from)f Fv(D)s(I)8 b(S)e(J)j Fx(.)p 2633 5253 49 49 v 404 5388 a(In)25 b([)545 5388 y SDict begin H.S end 545 5388 a Fx(65)643 5324 y SDict begin H.R end 643 5324 a 643 5388 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.TessonT05) cvn H.B /ANN pdfmark end 643 5388 a Fx(],)i(the)f(same)f(approac)m (h)h(is)f(used)i(to)e(obtain)f(complete)h(classi\034cation)f(results)p eop end %%Page: 13 13 TeXDict begin 13 12 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.13) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(for)23 b(the)g(t)m(w)m(o-part)m(y)h(comm)m(unication)d(complexit)m(y)h(of)h (regular)f(languages)g(in)g(the)i(prob-)257 693 y(abilistic)34 b(and)j(non-in)m(teractiv)m(e)f(v)-5 b(arian)m(ts)37 b(of)f(the)h(t)m(w)m(o-part)m(y)h(mo)s(del.)54 b(In)m(terestingly)-8 b(,)257 814 y(all)43 b(the)h(lo)m(w)m(er)h(b)s(ounds)g(are)f(obtained)g (through)g(reductions)h(from)e(four)h(problems)257 934 y(\(inner)32 b(pro)s(duct)f(mo)s(dulo)f Fv(p)p Fx(,)i(disjoin)m(tness,) g(greater)f(than)h(and)f(indexing\))g(whic)m(h)h(are)257 1054 y(among)e(the)h(most-studied)g(examples)g(in)f(comm)m(unication)e (complexit)m(y)-8 b(.)42 b(In)32 b(a)e(sense,)257 1175 y(the)j(classi\034cation)e(results)i(retrosp)s(ectiv)m(ely)g(explain)f (their)g(piv)m(otal)f(imp)s(ortance.)404 1295 y(One)41 b(can)g(also)e(deriv)m(e)i(the)g(follo)m(wing)d(corollary)h(from)g (elemen)m(ts)i(of)f(the)h(ab)s(o)m(v)m(e)257 1416 y(pro)s(of.)257 1435 y SDict begin H.S end 257 1435 a 257 1435 a SDict begin 14.5 H.A end 257 1435 a 257 1435 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.9) cvn H.B /DEST pdfmark end 257 1435 a 161 x Fn(Corollary)36 b(9.)41 b Fr(If)33 b Fv(L)i Fr(is)e(a)h(r)-5 b(e)g(gular)33 b(language)g(then)h(the)g(c)-5 b(orr)g(esp)g(onding)32 b(c)-5 b(ommunic)g(a-)257 1716 y(tion)38 b(pr)-5 b(oblem)36 b(is)i(either)f(in)g Fv(P)51 b Fr(or)38 b(har)-5 b(d)37 b(for)g(one)g(of)h(the)f(classes)g Fv(N)10 b(P)k Fr(,)38 b Fv(co)24 b Fq(\000)h Fv(N)10 b(P)51 b Fr(or)257 1837 y(Mo)-5 b(d)439 1852 y Ft(p)479 1837 y Fv(P)48 b Fr(for)35 b(some)f(prime)g Fv(p)28 b Fq(\025)g Fu(2)p Fr(.)404 2017 y Fx(In)48 b(this)f(sense,)53 b(regular)47 b(languages)f(exhibit)h(a)g(v)m(ery)j(nice)d(b)s(eha)m (vior)g(with)g(re-)257 2138 y(sp)s(ect)40 b(to)f(comm)m(unication)e (complexit)m(y)h(and)h(this)g(corollary)f(is)g(reminiscen)m(t)h(of)f (re-)257 2258 y(sults)32 b(ab)s(out)e(leaf)g(language)g(classes)j (de\034ned)f(b)m(y)g(regular)e(languages)h([)2925 2258 y SDict begin H.S end 2925 2258 a Fx(17)3022 2194 y SDict begin H.R end 3022 2194 a 3022 2258 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Borchert95) cvn H.B /ANN pdfmark end 3022 2258 a Fx(].)44 b(Using)30 b(an)257 2379 y(argumen)m(t)41 b(closely)f(related)g(to)g(Barrington's)g(theorem)g(\(see)i(Section) 2993 2379 y SDict begin H.S end 2993 2379 a Fx(4)3042 2314 y SDict begin H.R end 3042 2314 a 3042 2379 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (section.4) cvn H.B /ANN pdfmark end 3042 2379 a Fx(\))e(it)g(is)g(also)257 2499 y(p)s(ossible)k(to)f(sho)m(w)i(that)f(there)h(an)m(y)f(regular)f (language)g(whose)i(syn)m(tactic)g(monoid)257 2619 y(con)m(tains)40 b(a)f(non-solv)-5 b(able)39 b(group)g(is)g(complete)g(for)g(the)h (class)g(PSP)-8 b(A)m(CE)42 b(whic)m(h,)g(in)257 2740 y(the)33 b(comm)m(unication)d(complexit)m(y)i(con)m(text,)i(is)e (de\034ned)i(using)e(alternation)f([)3190 2740 y SDict begin H.S end 3190 2740 a Fx(5)3238 2675 y SDict begin H.R end 3238 2675 a 3238 2740 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BabaiFS86) cvn H.B /ANN pdfmark end 3238 2740 a Fx(].)404 2860 y(It)f(can)h(b)s(e)g(sho)m(wn)h(if)d Fq(V)39 b Fx(is)30 b(a)g(v)-5 b(ariet)m(y)31 b(of)f(languages)g(and)h Fv(p;)17 b(q)34 b Fx(are)c(distinct)g(primes)257 2980 y(then)k(Mo)s(d)675 2995 y Ft(p)714 2980 y Fu(\()p Fq(V)8 b Fu(\))p Fq(\\)33 b Fx(Mo)s(d)1153 2995 y Ft(q)1191 2980 y Fu(\()p Fq(V)8 b Fu(\))28 b(=)g(UP)m(ol\()p Fq(V)8 b Fu(\))33 b Fx([)1885 2980 y SDict begin H.S end 1885 2980 a Fx(46)1983 2916 y SDict begin H.R end 1983 2916 a 1983 2980 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Pin97) cvn H.B /ANN pdfmark end 1983 2980 a Fx(].)43 b(This)33 b(yields:)257 3008 y SDict begin H.S end 257 3008 a 257 3008 a SDict begin 14.5 H.A end 257 3008 a 257 3008 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.10) cvn H.B /DEST pdfmark end 257 3008 a 153 x Fn(Corollary)h(10.)40 b Fr(If)31 b Fv(L)h Fr(is)g(a)g(r)-5 b(e)g(gular)32 b(language)f(such)h(that)g (for)g(two)g(distinct)g(primes)f Fv(p)257 3281 y Fr(and)i Fv(q)k Fr(we)32 b(have)h(b)-5 b(oth)32 b Fv(N)1182 3245 y Ft(M)7 b(O)r(D)1371 3253 y Fi(p)1411 3281 y Fu(\()p Fv(L)p Fu(\))28 b(=)g Fv(O)s Fu(\(log)17 b Fv(n)p Fu(\))33 b Fr(and)f Fv(N)2347 3245 y Ft(M)7 b(O)r(D)2536 3253 y Fi(q)2575 3281 y Fu(\()p Fv(L)p Fu(\))27 b(=)h Fv(O)s Fu(\(log)17 b Fv(n)p Fu(\))p Fr(.)44 b(Then)257 3402 y Fv(D)s Fu(\()p Fv(L)p Fu(\))28 b(=)g Fv(O)s Fu(\(log)16 b Fv(n)p Fu(\))p Fr(.)404 3582 y Fx(It)24 b(is)f(unclear)h(whether)h (this)f(corollary)e(holds)h(only)h(for)f(regular)g(languages:)38 b(w)m(e)25 b(do)257 3703 y(not)e(kno)m(w)h(of)f(an)m(y)h(language)e(in) g Fu(\(Mo)s(d)1677 3718 y Ft(p)1717 3703 y Fu(P)s Fq(\\)s Fu(Mo)s(d)2050 3718 y Ft(q)2088 3703 y Fu(P\))s Fq(\000)s Fu(P)i Fx(and)f(it)f(is)h(quite)g(p)s(ossible)f(that)257 3823 y(these)32 b(classes)f(are)g(in)f(fact)g(equal.)42 b(F)-8 b(or)30 b(the)h(usual)f(time/space)g(classes)h(one)g(susp)s (ects)257 3944 y(that)i(Mo)s(d)664 3959 y Ft(p)703 3944 y Fu(P)23 b Fq(\\)f Fu(Mo)s(d)1075 3959 y Ft(q)1113 3944 y Fu(P)28 b Fq(6)p Fu(=)g Fv(P)46 b Fx(since)32 b(Mo)s(d)1853 3959 y Ft(p)1893 3944 y Fu(P)22 b Fq(\\)h Fu(Mo)s(d)2265 3959 y Ft(q)2303 3944 y Fu(P)33 b Fx(at)f(least)g(con)m(tains)g(the)h (class)257 4064 y(UP)d(of)f(unam)m(biguous)f(p)s(olynomial)e(time)i (whic)m(h)i(is)f(b)s(eliev)m(ed)g(to)g(b)s(e)g(distinct)g(from)f(P)-8 b(.)257 4184 y(Ho)m(w)m(ev)m(er)41 b(the)e(comm)m(unication)c (complexit)m(y)j(analogue)f(of)h(UP)h(is)f(in)f(fact)h(equal)h(to)257 4305 y(P)33 b([)383 4305 y SDict begin H.S end 383 4305 a Fx(37)481 4240 y SDict begin H.R end 481 4240 a 481 4305 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KarchmerNSW94) cvn H.B /ANN pdfmark end 481 4305 a Fx(])f(and)h(it)f(has)h(also)e(b)s (een)i(sho)m(wn)h(that)f Fu(NP)22 b Fq(\\)h Fu(co)p Fx(\025)p Fv(N)10 b(P)41 b Fu(=)28 b Fv(P)46 b Fx([)2758 4305 y SDict begin H.S end 2758 4305 a Fx(40)2855 4240 y SDict begin H.R end 2855 4240 a 2855 4305 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KN97) cvn H.B /ANN pdfmark end 2855 4305 a Fx(].)404 4425 y(It)40 b(w)m(ould)f(b)s(e)h(v)m(ery)h(in)m (teresting)f(to)f(also)g(obtain)g(a)g(complete)g(classi\034cation)f (re-)257 4545 y(sult)52 b(for)g(the)h(comm)m(unication)c(complexit)m(y) j(of)g(regular)f(languages)g(in)h(the)h(non-)257 4666 y(deterministic)40 b(mo)s(del.)67 b(This)41 b(task)h(ho)m(w)m(ev)m(er)h (requires)f(the)g(use)g(of)e(more)h(sophisti-)257 4786 y(cated)36 b(algebraic)d(mac)m(hinery)i(and)h(the)f(k)m(ey)i(Lemma)2301 4786 y SDict begin H.S end 2301 4786 a Fx(7)2349 4722 y SDict begin H.R end 2349 4722 a 2349 4786 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.7) cvn H.B /ANN pdfmark end 2349 4786 a 36 w Fx(has)e(to)g(b)s(e)g(re\034ned.)53 b(Indeed,)257 4907 y(this)40 b(lemma)f(essen)m(tially)h(states)h(that)f (the)h(comm)m(unication)d(complexit)m(y)i(of)g(a)g(reg-)257 5027 y(ular)35 b(language)g(in)g(the)i(deterministic)d(or)i(Mo)s(d)2067 5042 y Ft(p)2106 5027 y Fx(-coun)m(ting)f(mo)s(dels)g(dep)s(ends)j(on)e (its)257 5147 y(syn)m(tactic)41 b(monoid.)65 b(A)41 b(regular)e (language)g(and)i(its)e(complemen)m(t)h(share)h(the)f(same)257 5268 y(syn)m(tactic)34 b(monoid)d(but)i(migh)m(t)e(ha)m(v)m(e)j(v)m (ery)h(di\033eren)m(t)e(non-deterministic)d(comm)m(uni-)257 5388 y(cation)24 b(complexit)m(y)-8 b(.)40 b(T)-8 b(o)24 b(circum)m(v)m(en)m(t)h(the)g(problem)e(one)h(needs)i(to)e(consider)h (so-called)p eop end %%Page: 14 14 TeXDict begin 14 13 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch 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Fv(k)i(n)p Fx(-bit)c(strings)h Fv(x)1932 5352 y Fw(1)1972 5388 y Fv(;)17 b(:)g(:)g(:)f(;)h(x)2246 5352 y Ft(k)2324 5388 y Fx(whic)m(h)37 b(is)f Fu(1)g Fx(if)f(the)h(n)m(um)m(b)s(er)h(of)p eop end %%Page: 15 15 TeXDict begin 15 14 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.15) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(indices)43 b Fv(i)g Fx(suc)m(h)h(that)f Fv(x)1171 537 y Fw(1)1171 597 y Ft(i)1256 573 y Fu(=)i Fv(x)1432 537 y Fw(2)1432 597 y Ft(i)1516 573 y Fu(=)g Fv(:)17 b(:)g(:)45 b Fu(=)g Fv(x)1973 537 y Ft(k)1973 597 y(i)2061 573 y Fu(=)g(1)e Fx(is)f(divisible)f(b)m(y)i Fv(p)p Fx(.)75 b(Note)42 b(that)257 693 y(for)37 b Fv(k)i 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y(comm)m(unication)20 b(complexit)m(y)i(of)g(regular)f(languages)h(can)h(b)s(e)f(established) h([)3077 1656 y SDict begin H.S end 3077 1656 a Fx(19)3174 1592 y SDict begin H.R end 3174 1592 a 3174 1656 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.CKSTT06) cvn H.B /ANN pdfmark end 3174 1656 a Fx(,)3224 1656 y SDict begin H.S end 3224 1656 a Fx(50)3321 1592 y SDict begin H.R end 3321 1592 a 3321 1656 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.RaymondTT98) cvn H.B /ANN pdfmark end 3321 1656 a Fx(,)3371 1656 y SDict begin H.S end 3371 1656 a Fx(62)3468 1592 y SDict begin H.R end 3468 1592 a 3468 1656 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Tesson03) cvn H.B /ANN pdfmark end 3468 1656 a Fx(])257 1777 y(although)j(the)g (picture)h(is)f(not)g(as)h(clear)f(as)g(the)h(one)g(obtained)f(in)f (the)i(t)m(w)m(o-part)m(y)g(case.)257 1796 y SDict begin H.S end 257 1796 a 257 1796 a SDict begin 14.5 H.A end 257 1796 a 257 1796 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.12) cvn H.B /DEST pdfmark end 257 1796 a 161 x Fn(Theorem)g(12)f (\([)935 1957 y SDict begin H.S end 935 1957 a Fn(19)1047 1893 y SDict begin H.R end 1047 1893 a 1047 1957 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.CKSTT06) cvn H.B /ANN pdfmark end 1047 1957 a Fn(,)1105 1957 y SDict begin H.S end 1105 1957 a Fn(50)1217 1893 y SDict begin H.R end 1217 1893 a 1217 1957 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.RaymondTT98) cvn H.B /ANN pdfmark end 1217 1957 a Fn(,)1275 1957 y SDict begin H.S end 1275 1957 a Fn(62)1387 1893 y SDict begin H.R end 1387 1893 a 1387 1957 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Tesson03) cvn H.B /ANN pdfmark end 1387 1957 a Fn(]\).)34 b Fr(L)-5 b(et)26 b Fv(L)i Fq(\022)h Fu(\006)1956 1921 y Fs(\003)2022 1957 y Fr(b)-5 b(e)26 b(a)g(r)-5 b(e)g(gular)26 b(language)f(with)h (syntactic)257 2078 y(monoid)36 b Fv(M)43 b Fu(=)32 b Fv(M)10 b Fu(\()p Fv(L)p Fu(\))p Fr(.)53 b(If)36 b Fv(M)48 b Fr(lies)37 b(in)g Fo(DO)24 b Fq(\\)p 2011 1997 183 4 v 24 w Fo(G)2099 2093 y Fl(nil)2231 2078 y Fr(then)37 b(ther)-5 b(e)37 b(exists)f(a)h(c)-5 b(onstant)37 b Fv(k)257 2198 y Fr(such)e(that)g Fv(D)759 2213 y Ft(k)802 2198 y Fu(\()p Fv(L)p Fu(\))28 b(=)f Fv(O)s Fu(\(1\))p Fr(.)44 b(Otherwise,)34 b(we)g(have)g Fv(D)2288 2213 y Ft(k)2331 2198 y Fu(\()p Fv(L)p Fu(\))28 b(=)f Fv(!)t Fu(\(1\))34 b Fr(for)h(al)5 b(l)34 b Fv(k)s Fr(.)404 2318 y(If)e Fv(M)44 b Fr(is)32 b(a)h(gr)-5 b(oup)33 b(in)f Fo(G)1298 2333 y Fl(nil)p Ft(;)p Fl(k)1488 2318 y Fr(then)h Fv(D)1784 2333 y Ft(k)r Fw(+1)1917 2318 y Fu(\()p Fv(L)p Fu(\))28 b(=)f Fv(O)s Fu(\(1\))p Fr(.)43 b(If)33 b(however)e Fv(M)44 b Fr(is)33 b(a)f(gr)-5 b(oup)257 2439 y(outside)35 b Fo(G)679 2454 y Fl(nil)p Ft(;)p Fl(k)871 2439 y Fr(then)g Fv(D)1169 2454 y Ft(k)r Fw(+1)1302 2439 y Fu(\()p Fv(L)p Fu(\))27 b(=)h(\012\()p Fv(n)p Fu(\))p Fr(.)404 2619 y Fn(Pro)s(of)46 b(sk)m(etc)m(h.)68 b Fx(Let)41 b(us)g(\034rst)g(argue) g(the)g(second)h(half)d(of)h(the)h(theorem.)68 b(W)-8 b(e)257 2740 y(kno)m(w)42 b(that)e(if)f Fv(M)51 b Fx(is)40 b(a)g(nilp)s(oten)m(t)f(group)h(of)g(class)g Fv(k)j Fx(then)e Fv(L)g Fx(coun)m(ts)g(sub)m(w)m(ords)i(of)257 2860 y(length)29 b Fv(k)i Fx(mo)s(dulo)c(some)h(in)m(teger)h Fv(m)p Fx(.)43 b(In)29 b(the)g Fv(k)17 b Fu(+)d(1)p Fx(-part)m(y)29 b(mo)s(del)e(ev)m(ery)j(input)f(letter)257 2980 y(is)35 b(accessible)h(to)g Fv(k)i Fx(pla)m(y)m(ers)f(and)e(so)h(an)m(y)g Fv(k)s Fx(-tuple)f(is)g(seen)i(en)m(tirely)e(b)m(y)i(at)e(least)g(one) 257 3101 y(pla)m(y)m(er.)41 b(Therefore,)26 b(the)e(pla)m(y)m(ers)g (can)g(coun)m(t)g(mo)s(dulo)d Fv(m)i Fx(the)h(n)m(um)m(b)s(er)g(of)e(o) s(ccurrences)257 3221 y(of)40 b(a)g(sub)m(w)m(ord)i(of)e(length)g Fv(k)j Fx(with)d(comm)m(unication)e(at)i(most)g Fu(\()p Fv(k)30 b Fu(+)d(1\))h Fq(\001)f(d)p Fu(log)18 b Fv(m)p Fq(e)p Fx(,)42 b(a)257 3342 y(constan)m(t,)34 b(and)e(so)h Fv(D)1068 3357 y Ft(k)1111 3342 y Fu(\()p Fv(L)p Fu(\))28 b(=)f Fv(O)s Fu(\(1\))p Fx(.)404 3462 y(F)-8 b(or)28 b(the)h(matc)m(hing)e(lo)m(w)m(er)i(b)s(ound)g(w)m(e)g(kno)m(w)h(that)e (in)g(the)h(group)g Fv(M)39 b Fx(is)28 b(not)h(nilp)s(o-)257 3582 y(ten)m(t)43 b(of)e(class)i Fv(k)i Fx(there)d(are)g(elemen)m(ts)g Fv(g)1810 3597 y Fw(1)1849 3582 y Fv(;)17 b(:)g(:)g(:)f(;)h(g)2115 3597 y Ft(k)r Fw(+1)2289 3582 y Fx(suc)m(h)44 b(that)e(the)g(iterated)f (com-)257 3703 y(m)m(utator)c Fu([)p Fv(:)17 b(:)g(:)f Fu([[)p Fv(g)898 3718 y Fw(1)937 3703 y Fv(;)h(g)1028 3718 y Fw(2)1067 3703 y Fu(])p Fv(;)g(g)1185 3718 y Fw(3)1224 3703 y Fu(])p Fv(;)g(:)g(:)g(:)f(;)h(g)1517 3718 y Ft(k)r Fw(+1)1649 3703 y Fu(])37 b Fx(has)h(order)f Fv(q)j(>)35 b Fu(1)p Fx(.)57 b(An)38 b(argumen)m(t)f(similar)d(to)257 3823 y(the)d(one)f(sk)m(etc)m(hed)i(for)d(Theorem)1544 3823 y SDict begin H.S end 1544 3823 a Fx(8)1593 3759 y SDict begin H.R end 1593 3759 a 1593 3823 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.8) cvn H.B /ANN pdfmark end 1593 3823 a 30 w Fx(then)h(pro)m(vides)h(a)e(linear)g(length)g (reduction)g(from)257 3944 y Fv(GI)8 b(P)448 3959 y Ft(k)r Fw(+1)p Ft(;q)667 3944 y Fx(to)32 b(the)h(w)m(ord)g(problem)e(for)h Fv(M)10 b Fx(.)404 4064 y(T)-8 b(o)23 b(pro)m(vide)h(the)f(\034rst)h (upp)s(er)g(b)s(ound,)h(it)e(su\036ces)i(to)e(sho)m(w)h(that)f(if)g Fv(K)34 b Fq(\022)29 b Fu(\(\006)s Fq(\000)s(f)p Fv(a)p Fq(g)p Fu(\))3455 4028 y Fs(\003)257 4184 y Fx(and)k Fv(L)28 b Fq(\022)g Fu(\006)716 4148 y Fs(\003)789 4184 y Fx(ha)m(v)m(e)33 b(b)s(ounded)h Fv(k)s Fx(-part)m(y)e(complexit)m(y)g (for)g(some)g Fv(k)k Fx(then)d(the)g(p)s(erfectly)257 4305 y(unam)m(biguous)38 b(concatenation)f Fv(K)7 b(aL)39 b Fx(has)f(b)s(ounded)h Fv(k)29 b Fu(+)c(1)p Fx(-part)m(y)38 b(complexit)m(y)-8 b(.)59 b(T)-8 b(o)257 4425 y(lo)s(cate)32 b(the)i(\034rst)f(o)s(ccurrence)h(of)f Fv(a)p Fx(,)g(eac)m(h)h(pla)m(y) m(er)f(iden)m(ti\034es)g(the)h(part)m(y)f(holding)e(that)257 4545 y Fv(a)p Fx(.)73 b(Of)42 b(course)i(the)e(pla)m(y)m(er)h(actually) e(holding)f(it)i(will)e(b)s(e)i(incorrect)g(but)h(all)d(other)257 4666 y(pla)m(y)m(ers)33 b(will)c(agree.)44 b(Since)32 b Fv(k)23 b Fu(+)e(1)27 b Fq(\025)h Fu(3)p Fx(,)k(this)f(pro)s(cess)i (allo)m(ws)e Fv(k)k Fx(of)c(the)h Fv(k)24 b Fu(+)c(1)32 b Fx(parties)257 4786 y(to)h(iden)m(tify)f(the)i(lo)s(cation)c(of)j (the)g(\034rst)g Fv(a)g Fx(using)g(only)f Fu(\()p Fv(k)26 b Fu(+)c(1\))g Fq(\001)g(d)p Fu(log)r(\()p Fv(k)j Fu(+)d(1\))p Fq(e)33 b Fx(bits)g(of)257 4907 y(comm)m(unication)f(and)i(they)h(can)f (no)m(w)g(sim)m(ulate)f(the)h Fv(k)s Fx(-part)m(y)g(proto)s(cols)f(for) g Fv(K)41 b Fx(and)257 5027 y Fv(L)p Fx(.)404 5147 y(Finally)-8 b(,)28 b(b)m(y)k(Lemma)1233 5147 y SDict begin H.S end 1233 5147 a Fx(2)1282 5083 y SDict begin H.R end 1282 5083 a 1282 5147 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.2) cvn H.B /ANN pdfmark end 1282 5147 a Fx(,)f(it)f(su\036ces)i(to)f (establish)f(the)h Fv(!)t Fu(\(1\))f Fx(lo)m(w)m(er)g(b)s(ound)h(for)g Fv(T)3425 5162 y Ft(q)3463 5147 y Fx(-)257 5268 y(monoids)i(and)h(for)f (the)h(languages)f Fq(f)p Fv(a;)17 b(b)p Fq(g)1836 5232 y Fs(\003)1876 5268 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)2214 5232 y Fs(\003)2287 5268 y Fx(and)34 b Fu(\()p Fv(ab)p Fu(\))2646 5232 y Fs(\003)2686 5268 y Fx(.)47 b(First)33 b(one)h(can)g(use)257 5388 y(the)c(de\034nition)e(of)h Fv(T)1017 5403 y Ft(q)1055 5388 y Fx(-monoids)e(to)i(build)f(for)h(an)m (y)h(\034xed)g Fv(k)i Fx(a)d(reduction)g(from)f Fv(GI)8 b(P)3399 5403 y Ft(k)r(;q)p eop end %%Page: 16 16 TeXDict begin 16 15 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.16) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(to)22 b(the)h(w)m(ord)g(problem)e(of)g(a)h Fv(T)1352 588 y Ft(q)1391 573 y Fx(-monoid.)37 b(In)23 b(similar)c(fashion,)24 b(it)d(is)g(p)s(ossible)h(to)g(reduce)257 693 y(the)48 b Fv(k)s Fx(-part)m(y)f(generalization)e(of)i(the)h(disjoin)m(tness)f (function)g(to)g Fq(f)p Fv(a;)17 b(b)p Fq(g)3051 657 y Fs(\003)3090 693 y Fv(aa)p Fq(f)p Fv(a;)g(b)p Fq(g)3428 657 y Fs(\003)3468 693 y Fx(,)257 814 y(th)m(us)47 b(yielding)d(an)i Fu(\012\(log)18 b Fv(n)p Fu(\))46 b Fx(lo)m(w)m(er)g(b)s(ound)g(for)f (the)h(language.)82 b(The)47 b(last)e(b)s(ound)257 934 y(seems)c(to)e(b)s(e)h(the)g(most)e(di\036cult)h(and)h(is)f(obtained)g (through)g(Ramsey-theoretical)257 1054 y(argumen)m(ts.)p 802 1054 49 49 v 404 1177 a(In)i(man)m(y)g(m)m(ultipart)m(y)f(comm)m (unication)e(complexit)m(y)i(upp)s(er)i(b)s(ounds,)i(the)d(fact)257 1298 y(that)f(an)m(y)g Fv(k)30 b Fq(\000)e Fu(1)p 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(but)h(remains)e(op)s(en)i(in)f(general.)257 2674 y SDict begin H.S end 257 2674 a 257 2674 a SDict begin 14.5 H.A end 257 2674 a 257 2674 a SDict begin [ /View [/XYZ H.V] /Dest (subsection.3.3) cvn H.B /DEST pdfmark end 257 2674 a 133 x Fg(3.3)131 b(Characterizations)59 b(of)e(Languages)f(of)i(Bounded)f (Com-)557 2956 y(plexit)l(y)257 3146 y Fx(In)28 b(general,)h(w)m(e)f (can)g(de\034ne)h(the)f(comm)m(unication)e(complexit)m(y)h(of)g(a)g (\(not)h(necessarily)257 3267 y(regular\))e(language)g Fv(K)35 b Fq(\022)28 b Fu(\006)1314 3231 y Fs(\003)1381 3267 y Fx(as)g(the)f(complexit)m(y)f(of)h(testing)g(if)f(a)h(w)m(ord)g Fv(w)j Fx(b)s(elongs)d(to)257 3387 y Fv(K)37 b Fx(when)32 b(the)e(input)g(p)s(ositions)e(are)i(distributed)g(in)f(the)h(w)m(orst) h(p)s(ossible)e(w)m(a)m(y)i(among)257 3508 y(the)i(di\033eren)m(t)f (pla)m(y)m(ers.)44 b(W)-8 b(e)32 b(should)g(note)g(that)g(this)g(is)f (not)h(quite)g(the)g(de\034nition)f(w)m(e)257 3628 y(used)43 b(for)e(regular)g(languages)g(since)h(w)m(e)g(assumed)h(that)e(eac)m(h) h(input)g(p)s(osition)d(w)m(as)257 3748 y(either)g(some)g(letter)g(of)g Fu(\006)g Fx(or)g(the)h(empt)m(y)f(string)g Fv(\017)p Fx(.)63 b(Equiv)-5 b(alen)m(tly)d(,)40 b(Lemma)3250 3748 y SDict begin H.S end 3250 3748 a Fx(7)3299 3684 y SDict begin H.R end 3299 3684 a 3299 3748 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.7) cvn H.B /ANN pdfmark end 3299 3748 a 39 w Fx(and)257 3869 y(Theorems)714 3869 y SDict begin H.S end 714 3869 a Fx(8)763 3804 y SDict begin H.R end 763 3804 a 763 3869 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.8) cvn H.B /ANN pdfmark end 763 3869 a 38 w Fx(and)997 3869 y SDict begin H.S end 997 3869 a Fx(12)1094 3804 y SDict begin H.R end 1094 3804 a 1094 3869 a SDict begin [ /Color [1 0 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (theorem.12) cvn H.B /ANN pdfmark end 1094 3869 a 39 w Fx(could)e(b)s(e)h(stated)g 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Fx(can)f(simply)g(b)s(e)g (though)m(t)h(of)f(as)h(a)f(mapping)f Fv(t)3187 4440 y Fw(0)3256 4425 y Fx(\(resp.)257 4545 y Fv(t)292 4560 y Fw(1)332 4545 y Fx(\))36 b(from)e Fu([)p Fv(k)s Fu(])j Fx(to)e Fu([)p Fv(k)s Fu(])p Fx(.)54 b(Whic)m(h)36 b(of)g(these)h(t)m (w)m(o)f(transformations)f(is)g(applied)g(of)g(course)257 4666 y(dep)s(ends)c(on)f(the)g(v)-5 b(alue)29 b(of)g(the)h(input)f(bit) f(queried)i(at)g(that)f(lev)m(el.)42 b(An)m(y)31 b(input)e(to)g(the)257 4786 y(branc)m(hing)g(program)e(also)h(naturally)f(de\034nes)j(a)e (mapping)f(from)h(the)h Fv(k)i Fx(p)s(oin)m(ts)e(of)f(the)257 4907 y(\034rst)i(lev)m(el)f(to)g(the)h Fv(k)j Fx(p)s(oin)m(ts)c(of)g (the)h(last)e(lev)m(el,)i(whic)m(h)g(is)f(simply)f(the)i(comp)s (osition)d(of)257 5027 y(the)33 b(transformations)e(c)m(hosen)j(at)e (eac)m(h)i(lev)m(el.)404 5147 y(This)48 b(simple)f(observ)-5 b(ation)48 b(naturally)f(leads)i(to)f(an)h(algebraic)d(in)m (terpretation)257 5268 y(of)f(b)s(ounded-width)f(BPs)i(kno)m(wn)g(as)e Fr(non-uniform)h(automata)f Fx(or)h Fr(pr)-5 b(o)g(gr)g(ams)45 b(over)257 5388 y(monoid)p Fx(.)c(An)27 b Fv(n)p Fx(-input)f(program)f (of)i(length)f Fv(`)h Fx(o)m(v)m(er)h Fv(M)38 b Fx(is)26 b(a)h(sequence)i(of)e(instructions)p eop end %%Page: 19 19 TeXDict begin 19 18 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.19) cvn H.B /DEST pdfmark end 257 266 a 307 x Fv(\036)315 588 y Ft(n)390 573 y Fu(=)27 b(\()p Fv(i)564 588 y Fw(1)604 573 y Fv(;)17 b(f)696 588 y Fw(1)735 573 y Fu(\))p Fv(;)g(:)g(:)g(:)f (;)h Fu(\()p Fv(i)1063 588 y Ft(`)1096 573 y Fv(;)g(f)1188 588 y Ft(`)1221 573 y Fu(\))31 b Fx(where)j Fu(1)27 b Fq(\024)h Fv(i)1786 588 y 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b(and)g(that)f(p)s(olynomial)d(length)k(BPs)g(of)f (width)h Fv(k)j Fx(w)m(ere)e(strictly)e(less)h(p)s(o)m(w)m(erful)257 1897 y(than)g(p)s(olynomial)c(length)j(BPs)i(of)e(width)g Fv(k)17 b Fu(+)d(1)p Fx(.)42 b(Barrington,)29 b(ho)m(w)m(ev)m(er)h(pro) m(v)m(ed)h(this)257 2017 y(in)m(tuition)g(incorrect:)257 2017 y SDict begin H.S end 257 2017 a 257 2017 a SDict begin 14.5 H.A end 257 2017 a 257 2017 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.15) cvn H.B /DEST pdfmark end 257 2017 a 181 x Fn(Theorem)57 b(15)g(\([)996 2198 y SDict begin H.S end 996 2198 a Fn(7)1052 2133 y SDict begin H.R end 1052 2133 a 1052 2198 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Barrington89) cvn H.B /ANN pdfmark end 1052 2198 a Fn(]\).)50 b Fr(A)h(b)-5 b(o)g(ole)g(an)50 b(function)g(c)-5 b(an)50 b(b)-5 b(e)51 b(c)-5 b(ompute)g(d)50 b(by)h(a)f(family)h(of)257 2318 y(b)-5 b(ounde)g(d-width)41 b(BPs)g(of)g(p)-5 b(olynomial)41 b(length)g(if)g(and)g(only)h(if)f(it)h(b)-5 b(elongs)41 b(to)h Fu(NC)3354 2277 y Fw(1)3435 2318 y Fr(if)257 2439 y(and)31 b(only)h(if)f(it)h(c)-5 b(an)31 b(b)-5 b(e)31 b(c)-5 b(ompute)g(d)31 b(by)h(a)f(p)-5 b(olynomial-length)30 b(pr)-5 b(o)g(gr)g(am)30 b(over)i(any)f(non-)257 2559 y(solvable)j(gr)-5 b(oup.)404 2740 y Fx(If)34 b Fv(G)h Fx(is)f(a)g(non-trivial)e(group)i(suc)m(h)i(that)e Fu([)p Fv(G;)17 b(G)p Fu(])31 b(=)g Fv(G)k Fx(then)g(it)e(m)m(ust)i(b)s(e)g (simple,)257 2860 y(non-Ab)s(elian)k(and)h(hence)i(non-solv)-5 b(able.)65 b(The)42 b(k)m(ey)g(step)f(in)e(the)i(tric)m(kiest)g(part)f (of)257 2980 y(the)29 b(ab)s(o)m(v)m(e)g(theorem)e(in)m(v)m(olv)m(es)i (sho)m(wing)f(through)g(induction)f(on)h(depth)h(that)f(for)g(an)m(y) 257 3101 y Fu(NC)401 3059 y Fw(1)473 3101 y Fx(circuit)j Fv(C)39 b Fx(of)32 b(depth)h Fv(d)f Fx(and)h(an)m(y)g(elemen)m(t)f Fv(g)f Fq(2)d Fv(G)p Fx(,)33 b(there)g(is)f(a)g(program)f Fv(\036)3274 3116 y Ft(C)q(;g)3417 3101 y Fx(of)257 3221 y(length)e Fv(O)s Fu(\(4)717 3185 y Ft(d)757 3221 y Fu(\))h 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Ft(;g)2592 3727 y Fj(2)2660 3703 y Fx(where)32 b Fv(\036)2998 3718 y Ft(C)3048 3728 y Fi(i)3074 3718 y Ft(;g)3128 3728 y Fi(i)3158 3703 y Fu(\()p Fv(x)p Fu(\))c(=)f Fv(g)3467 3718 y Ft(i)257 3823 y Fx(if)h Fv(C)413 3838 y Ft(i)470 3823 y Fx(accepts)i Fv(x)f Fx(and)g Fu(1)1127 3838 y Ft(G)1215 3823 y Fx(otherwise.)43 b(One)29 b(can)g(no)m(w)h(easily)e(sho)m(w)i(that)e(the)i(program)257 3944 y Fv(\036)315 3959 y Ft(C)q(;g)454 3944 y Fu(=)d([)p Fv(\036)642 3959 y Ft(C)692 3968 y Fj(1)727 3959 y Ft(;g)781 3968 y Fj(1)819 3944 y Fv(;)17 b(\036)921 3959 y Ft(C)971 3968 y Fj(2)1005 3959 y Ft(;g)1059 3968 y Fj(2)1097 3944 y Fu(])33 b Fx(has)g(the)f(required)h(prop)s(ert)m(y)-8 b(.)404 4064 y(Since)35 b Fv(S)721 4079 y Fw(5)796 4064 y Fx(is)g(non-solv)-5 b(able,)34 b(it)h(follo)m(ws)f(that)h(p)s (olynomial)c(length)k(BPs)i(of)d(width)257 4184 y Fu(5)46 b Fx(are)g(as)g(p)s(o)m(w)m(erful)g(as)h(p)s(olynomial)42 b(length)j(BPs)i(of)f(an)m(y)g(\034xed)i(width)d(and)h(cap-)257 4305 y(ture)33 b(exactly)g(NC)942 4269 y Fw(1)982 4305 y Fx(.)43 b(In)m(terestingly)-8 b(,)33 b(some)f(of)g(the)h(most)f (studied)g(sub)s(classes)i(of)e Fu(NC)3456 4263 y Fw(1)257 4425 y Fx(also)38 b(admit)e(similar)f(algebraic)h(c)m(haracterizations) h([)2272 4425 y SDict begin H.S end 2272 4425 a Fx(9)2321 4361 y SDict begin H.R end 2321 4361 a 2321 4425 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonIS90) cvn H.B /ANN pdfmark end 2321 4425 a Fx(,)2386 4425 y SDict begin H.S end 2386 4425 a Fx(10)2484 4361 y SDict begin H.R end 2484 4361 a 2484 4425 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonS95) cvn H.B /ANN pdfmark end 2484 4425 a Fx(,)2549 4425 y SDict begin H.S end 2549 4425 a Fx(12)2647 4361 y SDict begin H.R end 2647 4361 a 2647 4425 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonT88) cvn H.B /ANN pdfmark end 2647 4425 a Fx(,)2712 4425 y SDict begin H.S end 2712 4425 a Fx(41)2809 4361 y SDict begin H.R end 2809 4361 a 2809 4425 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.McKenziePT91) cvn H.B /ANN pdfmark end 2809 4425 a Fx(].)61 b(In)38 b(particular,)257 4545 y Fu(A)m(C)398 4504 y Fw(0)468 4545 y Fx(,)31 b Fu(CC)667 4504 y Fw(0)737 4545 y Fx(and)g Fu(A)m(CC)1136 4504 y Fw(0)1206 4545 y Fx(are)g(precisely)f(captured)i(b)m(y)f(p)s(olynomial)c(length)j (programs)257 4666 y(o)m(v)m(er)42 b(resp)s(ectiv)m(ely)g(\034nite)f (ap)s(erio)s(dic)e(monoids,)i(\034nite)g(solv)-5 b(able)39 b(groups)j(and)e(\034nite)257 4786 y(solv)-5 b(able)34 b(monoids,)h(i.e.)f(monoids)g(whose)i(subgroups)g(are)f(solv)-5 b(able)34 b([)2904 4786 y SDict begin H.S end 2904 4786 a Fx(12)3002 4722 y SDict begin H.R end 3002 4722 a 3002 4786 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonT88) cvn H.B /ANN pdfmark end 3002 4786 a Fx(].)50 b(Recen)m(tly)-8 b(,)257 4907 y(the)31 b(class)f(TC)789 4870 y Fw(0)859 4907 y Fx(of)f(functions)h(computed)g(b)m(y)h(p)s(olynomial-size)26 b(threshold)k(circuits)g(of)257 5027 y(b)s(ounded)38 b(depth)f(has)g(also)e(b)s(een)i(sho)m(wn)h(to)e(admit)f(an)i (algebraic)d(c)m(haracterization)257 5147 y(using)f(in\034nite)e (groups)i([)1185 5147 y SDict begin H.S end 1185 5147 a Fx(39)1282 5083 y SDict begin H.R end 1282 5083 a 1282 5147 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KrebsLR05) cvn H.B /ANN pdfmark end 1282 5147 a Fx(].)404 5268 y(These)k(algebraic) d(c)m(haracterizations)h(can)h(pro)m(vide)g(useful)g(in)m(tuition)e (when)j(rea-)257 5388 y(soning)e(ab)s(out)f(circuits)g(and)h(w)m(ere,)i (for)d(instance,)i(instrumen)m(tal)e(in)g(understanding)p eop end %%Page: 20 20 TeXDict begin 20 19 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.20) cvn H.B /DEST pdfmark end 257 266 a 307 x Fx(the)36 b(computing)f(p)s(o)m(w)m(er)h(of)g(cylindrical)d(circuits)i([)2165 573 y SDict begin H.S end 2165 573 a Fx(31)2262 509 y SDict begin H.R end 2262 509 a 2262 573 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.HansenMV03) cvn H.B /ANN pdfmark end 2262 573 a Fx(,)2325 573 y SDict begin H.S end 2325 573 a Fx(30)2423 509 y SDict begin H.R end 2423 509 a 2423 573 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Hansen04) cvn H.B /ANN pdfmark end 2423 573 a Fx(].)53 b(The)36 b(fact)g(that)f(comput-)257 693 y(ing)40 b(the)h(sum)g(of)f Fv(n)h Fx(bits)f(mo)s(dulo)f Fv(p)h Fx(requires)i(exp)s(onen)m (tial-size)e Fu(A)m(C)2913 651 y Fw(0)2993 693 y Fx(circuits)h([)3371 693 y SDict begin H.S end 3371 693 a Fx(54)3468 629 y SDict begin H.R end 3468 629 a 3468 693 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Smolensky87) cvn H.B /ANN pdfmark end 3468 693 a Fx(])257 814 y(is)d(probably)f(the)h(most)g(celebrated)g (result)g(in)f(circuit)g(complexit)m(y)-8 b(.)58 b(The)39 b(algebraic)257 934 y(c)m(haracterization)29 b(of)g Fu(A)m(C)1215 892 y Fw(0)1284 934 y Fx(in)g(terms)g(of)g(group-free)g(monoids)f(w)m (as)i(not)f(kno)m(wn)i(when)257 1054 y(F)-8 b(urst,)30 b(Saxe)f(and)f(Sipser)h(originally)24 b(sho)m(w)m(ed)31 b(a)d(sup)s(er-p)s(olynomial)d(lo)m(w)m(er)j(b)s(ound)h(for)257 1175 y Fu(A)m(C)398 1133 y Fw(0)473 1175 y Fx(circuits)34 b(computing)g Fh(P)-8 b(arity)35 b Fx([)1702 1175 y SDict begin H.S end 1702 1175 a Fx(25)1799 1111 y SDict begin H.R end 1799 1111 a 1799 1175 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.FurstSS84) cvn H.B /ANN pdfmark end 1799 1175 a Fx(])h(but)f(in)g(retrosp)s(ect,)h(this)f(language)f(seems)257 1295 y(lik)m(e)e(an)h(ideal)e(candidate)h(since)h(its)f(syn)m(tactic)h (monoid)e(is)h(the)h(t)m(w)m(o-elemen)m(t)f(group.)404 1416 y(Man)m(y)g(of)e(the)i(op)s(en)f(questions)g(ab)s(out)g(the)g (relativ)m(e)g(p)s(o)m(w)m(er)g(of)g(these)h(classes)g(can)257 1536 y(th)m(us)37 b(b)s(e)g(recast)f(in)g(algebraic)e(terms)i([)1732 1536 y SDict begin H.S end 1732 1536 a Fx(12)1829 1472 y SDict begin H.R end 1829 1472 a 1829 1536 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonT88) cvn H.B /ANN pdfmark end 1829 1536 a Fx(,)1892 1536 y SDict begin H.S end 1892 1536 a Fx(41)1990 1472 y SDict begin H.R end 1990 1472 a 1990 1536 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.McKenziePT91) cvn H.B /ANN pdfmark end 1990 1536 a Fx(,)2053 1536 y SDict begin H.S end 2053 1536 a Fx(56)2151 1472 y SDict begin H.R end 2151 1472 a 2151 1536 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.Straubing00) cvn H.B /ANN pdfmark end 2151 1536 a Fx(].)54 b(It)36 b(is)f(for)h(instance)g (conjectured)257 1656 y(that)e Fu(CC)611 1615 y Fw(0)685 1656 y Fx(and)g Fu(A)m(CC)1087 1615 y Fw(0)1161 1656 y Fx(are)g(strict)g(subsets)i(of)d Fu(NC)2177 1615 y Fw(1)2250 1656 y Fx(and)i(this)e(is)h(equiv)-5 b(alen)m(t)34 b(to)g(p)s(os-)257 1777 y(tulating)i(that)h(p)s(olynomial)d(length)i (programs)h(o)m(v)m(er)h(resp)s(ectiv)m(ely)h(solv)-5 b(able)36 b(groups)257 1897 y(and)41 b(solv)-5 b(able)39 b(monoids)g(cannot)h(compute)g(the)h(w)m(ord)g(problem)e(of)h(a)g (non-solv)-5 b(able)257 2017 y(group.)63 b(One)39 b(adv)-5 b(an)m(tage)39 b(of)g(this)g(p)s(oin)m(t)f(of)g(view)h(is)g(that)g(it)f (prop)s(oses)i(meaningful)257 2138 y(in)m(termediate)34 b(steps)i(to)m(w)m(ards)f(a)g(pro)s(of)e(of)h(suc)m(h)i(separations.)50 b(F)-8 b(or)34 b(instance,)h(it)f(has)257 2258 y(b)s(een)f(sho)m(wn)h (that)e(programs)f(o)m(v)m(er)i(a)f(nilp)s(oten)m(t)e(group)i(cannot)h (compute)f(the)g Fv(n)p Fx(-bit)257 2379 y Fh(and)p Fx(,)h(regardless)h (of)f(the)g(program)f(length)h([)1953 2379 y SDict begin H.S end 1953 2379 a Fx(11)2050 2314 y SDict begin H.R end 2050 2314 a 2050 2379 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BarringtonST90) cvn H.B /ANN pdfmark end 2050 2379 a Fx(].)46 b(The)34 b(comm)m(unication)d(complexit)m(y)257 2499 y(results)k(of)e(the)h(previous)g(section)g(already)g(indicated)f (that)g(nilp)s(oten)m(t)g(groups)h(are)f(a)257 2619 y(particularly)h(w) m(eak)j(class)f(of)g(solv)-5 b(able)34 b(groups)i(so)h(suc)m(h)g(a)f (result)f(is)h(not)g(a)f(real)g(sur-)257 2740 y(prise.)44 b(Muc)m(h)33 b(less)g(trivial)c(is)j(the)g(fact)g(that)g(computing)f Fh(and)g Fx(using)h(programs)f(o)m(v)m(er)257 2860 y(the)40 b(pseudo-v)-5 b(ariet)m(y)41 b Fo(G)1176 2875 y Fl(p)1252 2860 y Fq(\003)27 b Fo(Ab)39 b Fx(\(generated)i(b)m(y)f(the)g (semidirect)f(pro)s(ducts)h(of)f(a)h Fv(p)p Fx(-)257 2980 y(group)32 b(with)g(an)g(Ab)s(elian)e(group\))i(requires)h(exp)s (onen)m(tial)e(length.)43 b(One)32 b(can)g(hop)s(e)h(to)257 3101 y(slo)m(wly)25 b(dev)m(elop)g(lo)m(w)m(er)g(b)s(ound)f(tec)m (hniques)j(for)d(larger)g(and)g(larger)g(classes)h(of)f(solv)-5 b(able)257 3221 y(groups)34 b(to)g(\034nally)f(obtain)f(the)j (separation)e(of)g Fu(CC)2191 3179 y Fw(0)2264 3221 y Fx(and)h Fu(NC)2599 3179 y Fw(1)2672 3221 y Fx(.)47 b(There)35 b(are)f(a)g(n)m(um-)257 3342 y(b)s(er)f(of)f(natural)g(candidates)g (for)g(the)h(next)h(class)f(of)f(solv)-5 b(able)31 b(groups)i(for)f (whic)m(h)h(one)257 3462 y(migh)m(t)k(hop)s(e)h(to)g(pro)m(v)m(e)h (program-length)c(lo)m(w)m(er)k(b)s(ounds,)h(including)c(sup)s(ersolv) -5 b(able)257 3582 y(groups)39 b(and)f(the)h(pseudo-v)-5 b(ariet)m(y)38 b Fo(G)1688 3597 y Fl(p)1764 3582 y Fq(\003)26 b Fo(G)1928 3597 y Fl(nil)2060 3582 y Fx(generated)39 b(b)m(y)g(semidirect)f(pro)s(ducts)257 3703 y(of)32 b Fv(p)p Fx(-groups)h(with)f(Ab)s(elian)f(groups.)404 3823 y(Results)d(on)g(the)g(comm)m(unication)e(complexit)m(y)h(of)h(classes) h(of)e(\034nite)h(monoids)f(can)257 3944 y(in)36 b(fact)h(b)s(e)f(used) i(to)e(pro)m(vide)h(length)f(lo)m(w)m(er)h(b)s(ounds)g(for)f(programs)g (o)m(v)m(er)h(the)g(same)257 4064 y(classes.)42 b(F)-8 b(or)24 b(instance)g(one)h(can)g(sho)m(w)g(that)g Fo(G)2008 4079 y Fl(p)2063 4064 y Fq(\003)6 b Fo(Ab)23 b Fx(is)h(a)g(sub)s(class) i(of)e Fo(LG)3081 4079 y Fl(p)3147 4064 y Fq(\015)-87 b Fh(m)30 b Fo(Com)257 4184 y Fx(and)39 b(so)g(an)m(y)g(group)f Fv(G)h Fx(in)e Fo(G)1374 4199 y Fl(p)1450 4184 y Fq(\003)26 b Fo(Ab)38 b Fx(has)h(logarithmic)c(t)m(w)m(o-part)m(y)k(Mo)s(d)3057 4199 y Ft(p)3097 4184 y Fx(-coun)m(ting)257 4305 y(comm)m(unication)29 b(complexit)m(y)-8 b(.)42 b(It)32 b(follo)m(ws)e(that)h(an)m(y)h (function)f(computed)g(b)m(y)i(a)e(pro-)257 4425 y(gram)23 b(of)g(length)g Fv(t)p Fu(\()p Fv(n)p Fu(\))h Fx(o)m(v)m(er)g Fv(G)g Fx(has)g(Mo)s(d)1742 4440 y Ft(p)1781 4425 y Fx(-coun)m(ting)f (complexit)m(y)g(at)g(most)g Fv(O)s Fu(\(log)17 b Fv(t)p Fu(\()p Fv(n)p Fu(\)\))257 4545 y Fx(and)26 b(in)g(particular,)f(exp)s (onen)m(tial)g(length)h(programs)f(are)g(required)i(to)e(compute)h (func-)257 4666 y(tions)36 b(lik)m(e)g Fv(I)8 b(P)797 4681 y Ft(q)871 4666 y Fx(\(for)36 b Fv(q)k Fx(not)c(a)g(p)s(o)m(w)m (er)i(of)e Fv(p)p Fx(\))g(whic)m(h)h(ha)m(v)m(e)h(linear)c(complexit)m (y)i(in)g(this)257 4786 y(mo)s(del.)70 b(It)42 b(can)f(similarly)d(b)s (e)k(sho)m(wn)h(that)f(a)f(group)h(in)f Fo(G)2578 4801 y Fl(p)2656 4786 y Fq(\003)28 b Fo(G)2822 4801 y Fl(nil)2958 4786 y Fx(has)42 b Fv(O)s Fu(\(log)17 b Fv(n)p Fu(\))257 4907 y Fx(Mo)s(d)452 4922 y Ft(p)492 4907 y Fx(-coun)m(ting)37 b Fv(k)s Fx(-part)m(y)g(comm)m(unication)e(complexit)m(y)i(for)g(some)g Fv(k)j Fx(and)e(so)g(p)s(oly-)257 5027 y(nomial)d(length)h(programs)h (o)m(v)m(er)h(these)g(groups)g(can)f(only)g(compute)g(functions)g(also) 257 5147 y(ha)m(ving)f(logarithmic)31 b(Mo)s(d)1287 5162 y Ft(p)1327 5147 y Fx(-coun)m(ting)k Fv(k)s Fx(-part)m(y)g(complexit)m (y)-8 b(.)51 b(Unfortunately)35 b(there)257 5268 y(are)c(curren)m(tly)g (no)f(kno)m(wn)i(sup)s(erlogarithmic)27 b(b)s(ounds)k(kno)m(wn)g(for)f (an)g(explicit)f(func-)257 5388 y(tion)j(in)g(this)g(mo)s(del.)p eop end %%Page: 21 21 TeXDict begin 21 20 bop 0 0 a SDict begin /product where{pop product(Distiller)search{pop pop pop version(.)search{exch pop exch pop(3011)eq{gsave newpath 0 0 moveto closepath clip/Courier findfont 10 scalefont setfont 72 72 moveto(.)show grestore}if}{pop}ifelse}{pop}ifelse}if end 0 0 a 257 266 a SDict begin H.S end 257 266 a 257 266 a SDict begin H.R end 257 266 a 257 266 a SDict begin [ /View [/XYZ H.V] /Dest (page.21) cvn H.B /DEST pdfmark end 257 266 a 404 573 a Fx(A)32 b(sligh)m(tly)e(di\033eren)m(t)i(p)s(ersp)s(ectiv)m(e)h(on)e(the)h (algebraic)e(c)m(haracterizations)i(of)f(sub-)257 693 y(classes)36 b(of)e Fu(NC)827 651 y Fw(1)901 693 y Fx(can)g(b)s(e)h (giv)m(en.)50 b(Using)34 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b(It)257 1656 y(should)41 b(b)s(e)g(noted)h(that,)h(as)e(in)f(the)i (comm)m(unication)c(complexit)m(y)i(con)m(text,)45 b(upp)s(er)257 1777 y(b)s(ounds)h(in)m(v)-5 b(ariably)42 b(follo)m(w)h(from)g(our)i (com)m(binatorial)c(understanding)k(of)f(regular)257 1897 y(languages)39 b(whereas)h(hardness)h(results)f(or)e(lo)m(w)m(er)i (b)s(ounds)f(usually)g(stem)g(from)f(the)257 2017 y(algebraic)28 b(p)s(ersp)s(ectiv)m(e.)44 b(A)30 b(n)m(um)m(b)s(er)g(of)f(basic)h (results)g(on)g(the)g(circuit)f(complexit)m(y)g(of)257 2138 y(regular)j(languages)g(can)h(b)s(e)f(found)h(in)f([)1759 2138 y SDict begin H.S end 1759 2138 a Fx(8)1808 2074 y SDict begin H.R end 1808 2074 a 1808 2138 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.BCST92) cvn H.B /ANN pdfmark end 1808 2138 a Fx(,)1867 2138 y SDict begin H.S end 1867 2138 a Fx(12)1965 2074 y SDict begin H.R end 1965 2074 a 1965 2138 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest 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[0 0 12] /Subtype /Link /Dest (cite.ChandraFL85) cvn H.B /ANN pdfmark end 2788 2619 a Fx(])g(sho)m(ws)i(that)e(an)m(y)257 2740 y(regular)h(language)f(in)h Fu(A)m(C)1258 2698 y Fw(0)1332 2740 y Fx(or)g Fu(A)m(CC)1666 2698 y Fw(0)1741 2740 y Fx(can)g(in)g(fact)g(b)s(e)h(computed)f(b)m(y)i (circuits)e(with)257 2860 y(only)d Fv(O)s Fu(\()p Fv(ng)696 2824 y Fs(\000)p Fw(1)789 2860 y Fu(\()p Fv(n)p Fu(\)\))h Fx(wires)g(for)f(an)m(y)h(primitiv)m(e)d(recursiv)m(e)k Fv(g)t Fx(.)404 2980 y(There)f(are)f(in)f(fact)h(regular)f(languages)g (lik)m(e)h(the)g Fh(and)g Fx(or)f(the)i Fh(P)-8 b(arity)31 b Fx(function)257 3101 y(whic)m(h)45 b(can)f(b)s(e)g(recognized)g(b)m (y)g(circuits)g(with)f(a)g(single)g(gate)h(and)g(linearly)d(man)m(y)257 3221 y(wires.)60 b(Recen)m(tly)-8 b(,)40 b(K)m(ouc)m(k\375)-8 b(,)41 b(Pudl\341k)d(and)g(Th\351rien)h([)2298 3221 y SDict begin H.S end 2298 3221 a Fx(38)2395 3157 y SDict begin H.R end 2395 3157 a 2395 3221 a SDict begin [ /Color [0 1 0] /H /I /Border [0 0 12] /Subtype /Link /Dest (cite.KouckyPT05) cvn H.B /ANN pdfmark end 2395 3221 a Fx(])f(ga)m(v)m(e)h(a)f(complete)f(c)m(harac-)257 3342 y(terization)j(of)g(regular)g(languages)g(recognized)h(b)m(y)h Fu(A)m(C)2386 3300 y Fw(0)2466 3342 y Fx(and)f Fu(A)m(CC)2875 3300 y Fw(0)2955 3342 y Fx(circuits)g(with)257 3462 y(linearly)29 b(man)m(y)i(wires)g(when)h(it)d(is)i(assumed)g(that)g(the)g(language)f (con)m(tains)g(a)h(neutral)257 3582 y(letter.)43 b(Once)34 b(again,)d(the)i(answ)m(er)h(turns)f(out)f(to)g(b)s(e)h(algebraic.)257 3602 y SDict begin H.S end 257 3602 a 257 3602 a SDict begin 14.5 H.A end 257 3602 a 257 3602 a SDict begin [ /View [/XYZ H.V] /Dest (theorem.16) cvn H.B /DEST pdfmark end 257 3602 a 161 x Fn(Theorem)45 b(16.)g Fr(L)-5 b(et)42 b Fv(L)f Fr(b)-5 b(e)41 b(a)g(r)-5 b(e)g(gular)41 b(language)g(with)f(a)h (neutr)-5 b(al)42 b(letter:)57 b Fv(L)42 b Fr(c)-5 b(an)41 b(b)-5 b(e)257 3883 y(r)g(e)g(c)g(o)g(gnize)g(d)27 b(by)h(an)f Fu(A)m(CC)1169 3842 y Fw(0)1236 3883 y Fr(cir)-5 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