%!PS-Adobe-2.0 %%Creator: dvips(k) 5.98 Copyright 2009 Radical Eye Software %%Title: arXiv:1010.3897v1 [math.AG] 19 Oct 2010 %%CreationDate: Wed Oct 20 09:47:46 2010 %%Pages: 27 %%PageOrder: Ascend %%BoundingBox: 0 0 596 842 %%DocumentFonts: EUFM10 %%DocumentPaperSizes: a4 %%EndComments %DVIPSWebPage: (www.radicaleye.com) %DVIPSCommandLine: dvips -R2 -P pk -K1 -z Mshim20101018.dvi -o %DVIPSParameters: dpi=600, compressed, comments removed %DVIPSSource: TeX output 2010.10.20:0947 %%BeginProcSet: texc.pro 0 0 /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 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Theorem) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.6.9) cvn/Title (6.9. Corollary) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 6/Dest (section.7) cvn/Title (7. Relation with K3 surfaces) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.1) cvn/Title (7.1. K3 quotient) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.2) cvn/Title (7.2. 2nd K3 surface) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.3) cvn/Title (7.3. Alternative elliptic fibration) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.4) cvn/Title (7.4. Inose pencil) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.5) cvn/Title (7.5. Kummer surface) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.7.6) cvn/Title (7.6. Remark) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 4/Dest (section.8) cvn/Title (8. Hilbert modular surfaces and Mumford-Tate groups) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.8.1) cvn/Title (8.1. The Shimura surface as Hilbert modular surface) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.8.2) cvn/Title (8.2. Mumford-Tate groups) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (subsection.8.3) cvn/Title (8.3. Remark) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (section*.1) cvn/Title (Acknowledgements) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/Count 0/Dest (section*.2) cvn/Title (References) /OUT pdfmark end -118 159 a -118 159 a SDict begin [/PageMode /UseOutlines/Page 1/View [/Fit] /DOCVIEW pdfmark end -118 159 a -118 159 a SDict begin [ {Catalog}<<>> /PUT pdfmark end -118 159 a -118 159 a SDict begin H.S end -118 159 a -118 159 a SDict begin 14 H.A end -118 159 a -118 159 a SDict begin [/View [/XYZ H.V]/Dest (Doc-Start) cvn /DEST pdfmark end -118 159 a 204 508 a Fz(TW)m(O)48 b(MODULI)h(SP)-9 b(A)m(CES)48 b(OF)h(ABELIAN)e(F)m(OURF)m(OLDS)j(WITH)d(AN)910 624 y(A)m(UTOMORPHISM)h(OF)h(ORDER)e(FIVE)935 873 y Fy(BER)-7 b(T)27 b(V)-9 b(AN)29 b(GEEMEN)d(AND)j(MA)-7 b(TTHIAS)29 b(SCH)2672 852 y(\177)2662 873 y(UTT)181 1119 y Fx(Abstra)n(ct.)41 b Fy(W)-7 b(e)37 b(\014nd)g(explicit)g(pro)5 b(jectiv)n(e)35 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b(are)e(2)1800 2940 y Fq(g)r Fm(\000)p Fr(1)1930 2977 y Ft(\(2)2017 2940 y Fq(g)2082 2977 y Ft(+)25 b(1\))36 b(ev)m(en)i(theta)f(c)m(haracteristics)g([)3460 2940 y Fq(\017)3460 3003 y(\017)3489 2984 y Fi(0)3515 2977 y Ft(])g(\(that)f(is)-118 3093 y(with)g Fs(\017;)17 b(\017)230 3057 y Fm(0)287 3093 y Fo(2)35 b(f)p Ft(0)p Fs(;)17 b Ft(1)p Fo(g)630 3057 y Fq(g)705 3093 y Ft(and)36 b Fs(\017)25 b Fo(\001)1015 3057 y Fq(t)1044 3093 y Fs(\017)1083 3057 y Fm(0)1141 3093 y Ft(=)34 b(0)i(mo)s(d)f(2\).)54 b(F)-8 b(or)36 b(an)g(ev)m(en)i(theta)e(c)m(haracteristic)g(the)h(corresp)s (onding)-118 3209 y(thetan)m(ull)g Fs(\022)s Ft([)377 3173 y Fq(\017)377 3235 y(\017)406 3217 y Fi(0)432 3209 y Ft(]\()p Fs(\034)11 b Ft(\),)40 b(a)d(holomorphic)f(function)h(on)h (the)g(Siegel)f(space)i Fz(H)2642 3224 y Fq(g)2682 3209 y Ft(,)g(do)s(es)f(not)g(v)-5 b(anish)38 b(iden)m(tically)-118 3325 y(and)33 b(it)e(is)h(a)h(mo)s(dular)d(form)h(of)h(w)m(eigh)m(t)h (1)p Fs(=)p Ft(2)f(for)g(a)g(certain)h(subgroup)g(of)f(\000)2716 3340 y Fq(g)2756 3325 y Ft(.)-18 3442 y(The)43 b(zero)f(lo)s(ci)e(of)i (the)g(thetan)m(ulls)g(ha)m(v)m(e)h(b)s(een)g(studied)g(extensiv)m(ely) -8 b(,)46 b(esp)s(ecially)41 b(in)g(lo)m(w)h(gen)m(us.)73 b(In)-118 3558 y(particular,)25 b(in)g(p)s(oin)m(ts)g(corresp)s(onding) h(to)f(pro)s(ducts)i(of)e(ppa)m(v's)i(\(with)e(pro)s(duct)h(p)s (olarisation\))c(and)k(p)s(oin)m(ts)-118 3674 y(in)k(the)h(b)s(oundary) h(of)e(the)h(Satak)m(e)h(compacti\014cation)d(man)m(y)i(thetan)m(ulls)f (v)-5 b(anish)31 b(\(cf.)g([)3127 3674 y SDict begin H.S end 3127 3674 a Ft(vG)3255 3606 y SDict begin H.R end 3255 3606 a 3255 3674 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.pmv) cvn H.B /ANN pdfmark end 3255 3674 a Ft(],)g(3.6,)g(3.7\).)42 b(F)-8 b(or)-118 3790 y(example,)34 b(let)g Fs(A)d Ft(=)f Fs(A)719 3805 y Fq(\034)797 3790 y Ft(b)s(e)k(a)g(ppa)m(v)h(whic)m(h)g(is)f(the)h(pro)s(duct)f(of)g(ppa) m(v's)i Fs(B)2665 3805 y Fr(1)2728 3790 y Fo(\002)24 b Fs(B)2903 3805 y Fr(2)2976 3790 y Ft(of)34 b(dimension)f Fs(a)i Ft(and)f Fs(b)p Ft(,)-118 3915 y(with)26 b(p)s(erio)s(d)g (matrices)g Fs(\034)823 3930 y Fq(a)865 3915 y Fs(;)17 b(\034)951 3930 y Fq(b)985 3915 y Ft(.)42 b(Then)28 b Fs(\022)s Ft([)1378 3879 y Fq(\017)1378 3941 y(\017)1407 3922 y Fi(0)1433 3915 y Ft(]\()p Fs(\034)11 b Ft(\))28 b(=)g Fs(\022)s Ft([)1796 3879 y Fq(\017)1825 3855 y Fh(\()p Fk(a)p Fh(\))1796 3952 y Fq(\017)1825 3932 y Fi(0)p Fh(\()p Fk(a)p Fh(\))1932 3915 y Ft(]\()p Fs(\034)2039 3930 y Fq(a)2081 3915 y Ft(\))p Fs(\022)s Ft([)2194 3879 y Fq(\017)2223 3855 y Fh(\()p Fk(b)p Fh(\))2194 3952 y Fq(\017)2223 3932 y Fi(0)p Fh(\()p Fk(b)p Fh(\))2325 3915 y Ft(]\()p Fs(\034)2432 3930 y Fq(b)2467 3915 y Ft(\))e(and)h(the)g(2)2926 3879 y Fq(a)p Fm(\000)p Fr(1)3058 3915 y Ft(\(2)3145 3879 y Fq(a)3196 3915 y Fo(\000)10 b Ft(1\))g Fo(\001)g Ft(2)3467 3879 y Fq(b)p Fm(\000)p Fr(1)3592 3915 y Ft(\(2)3679 3879 y Fq(b)3723 3915 y Fo(\000)g Ft(1\))-118 4046 y(thetan)m(ulls)32 b(with)g Fs(\017)596 4010 y Fr(\()p Fq(a)p Fr(\))715 4046 y Fo(\001)765 4010 y Fq(t)795 4046 y Fs(\017)834 4010 y Fm(0)p Fr(\()p Fq(a)p Fr(\))977 4046 y Ft(=)c(1)k(or)g Fs(\017)1320 4010 y Fr(\()p Fq(b)p Fr(\))1432 4046 y Fo(\001)1482 4010 y Fq(t)1512 4046 y Fs(\017)1551 4010 y Fm(0)p Fr(\()p Fq(b)p Fr(\))1687 4046 y Ft(=)c(1)k(v)-5 b(anish)32 b(in)g Fs(\034)39 b Fo(2)28 b Fz(H)2550 4061 y Fq(g)2590 4046 y Ft(.)-18 4162 y(F)-8 b(or)41 b(example,)j(6)28 b Fo(\001)g Ft(6)43 b(=)h(36)d(ev)m(en)j(thetan)m(ulls)d(v)-5 b(anish)42 b(in)f(a)h(p)s(oin)m(t)f(whic)m(h)h(is)g(the)g(pro)s(duct)g(of)g(t)m(w) m(o)g(2-)-118 4278 y(dimensional)d(ppa)m(v's)k Fs(B)815 4293 y Fr(1)883 4278 y Fo(\002)28 b Fs(B)1062 4293 y Fr(2)1102 4278 y Ft(.)70 b(In)42 b(case)g Fs(B)1619 4293 y Fr(1)1700 4278 y Ft(is)f(isomorphic)f(to)h(the)h(pro)s(duct)g(of)f(t) m(w)m(o)h(elliptic)d(curv)m(es)-118 4395 y(\(with)34 b(pro)s(duct)g(p)s(olarisation\),)d(one)k(thetan)m(ull)e(of)h Fs(B)1896 4410 y Fr(1)1970 4395 y Ft(also)f(v)-5 b(anishes,)35 b(and)f(this)g(leads)g(to)g(the)h(v)-5 b(anishing)-118 4511 y(of)32 b(36)22 b(+)g(1)g Fo(\001)f Ft(10)28 b(=)f(46)32 b(thetan)m(ulls)g(for)g(the)h(ppa)m(v)h Fs(B)1773 4526 y Fr(1)1834 4511 y Fo(\002)23 b Fs(B)2008 4526 y Fr(2)2048 4511 y Ft(,)32 b(etc.)-18 4627 y(An)m(y)25 b(p)s(oin)m(t)g(in)f(the)h (b)s(oundary)g(of)g(\(the)g(Satak)m(e)h(compacti\014cation)d(of)7 b(\))24 b Fs(A)2681 4643 y Fq(g)r(;)p Fr(\(2)p Fq(;)p Fr(4\))2911 4627 y Ft(is)g(the)i(limit)21 b(of)k(a)f(pro)s(duct)-118 4750 y(of)35 b(ppa)m(v's)h Fs(B)376 4765 y Fr(1)440 4750 y Fo(\002)24 b Fs(B)615 4765 y Fr(2)690 4750 y Ft(where)36 b Fs(B)1048 4765 y Fr(2)1123 4750 y Ft(degenerates)h(to)d(a)h(torus)h (\()p Fz(C)2229 4714 y Fm(\002)2288 4750 y Ft(\))2326 4714 y Fq(b)2360 4750 y Ft(.)51 b(In)36 b(suc)m(h)g(a)f(b)s(oundary)h (p)s(oin)m(t,)f(b)s(esides)-118 4880 y(the)30 b(2)96 4844 y Fq(a)p Fm(\000)p Fr(1)228 4880 y Ft(\(2)315 4844 y Fq(a)374 4880 y Fo(\000)17 b Ft(1\))g Fo(\001)g Ft(2)666 4844 y Fq(b)p Fm(\000)p Fr(1)790 4880 y Ft(\(2)877 4844 y Fq(b)928 4880 y Fo(\000)h Ft(1\))30 b(thetan)m(ulls)f(whic)m(h)i(v)-5 b(anish)30 b(on)g(the)h(pro)s(duct,)g(also)e(the)h(thetan)m(ulls)g Fs(\022)s Ft([)3740 4844 y Fq(\017)3769 4820 y Fh(\()p Fk(b)p Fh(\))3740 4917 y Fq(\017)3769 4897 y Fi(0)p Fh(\()p Fk(b)p Fh(\))3871 4880 y Ft(])p eop end end %%Page: 5 5 TeXDict begin HPSdict begin 5 4 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 -126 -32 a SDict begin H.S end -126 -32 a -126 -32 a SDict begin H.R end -126 -32 a -126 -32 a SDict begin [/View [/XYZ H.V]/Dest (page.5) cvn /DEST pdfmark end -126 -32 a 40 43 a Fp(TW)n(O)33 b(MODULI)f(SP)-6 b(A)n(CES)33 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b(=)f(2)3179 3415 y Fq(g)3241 3456 y Ft(+)22 b(2)3388 3415 y Fq(g)r Fm(\000)p Fr(1)3518 3456 y Ft(\(2)3605 3415 y Fq(g)3667 3456 y Ft(+)g(1\)\))-118 3617 y(factors)35 b(o)m(v)m(er)i(a)e(normal)f (subgroup)i(\000)1319 3632 y Fq(g)1359 3617 y Ft(\(2)p Fs(;)17 b Ft(4)p Fs(;)g Ft(8\))34 b(of)h Fs(S)6 b(p)p Ft(\(2)p Fs(g)t(;)17 b Fz(Z)p Ft(\))34 b(\(see)j([)2481 3617 y SDict begin H.S end 2481 3617 a Ft(vGN)2682 3549 y SDict begin H.R end 2682 3549 a 2682 3617 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.vGN) cvn H.B /ANN pdfmark end 2682 3617 a Ft(]\).)52 b(Th)m(us)37 b(the)f(double)f(co)m(v)m (er)i(of)-118 3735 y(\002\()p Fz(H)84 3750 y Fq(g)123 3735 y Ft(\))28 b Fo(\032)g Fz(P)371 3699 y Fr(2)406 3675 y Fk(g)442 3699 y Fm(\000)p Fr(1)567 3735 y Ft(de\014ned)j(in)f Fz(P)1089 3699 y Fr(2)1124 3675 y Fk(g)1192 3735 y Fo(\032)e Fz(P)1374 3699 y Fq(M)1482 3735 y Ft(b)m(y)k(the)e(equation)g Fs(T)2248 3699 y Fr(2)2315 3735 y Ft(=)d Fs(Q)p 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Ft(is)g(also)g(a)h(Shim)m(ura)-118 1305 y(curv)m(e.)43 b(The)27 b Fs(j)6 b Ft(-in)m(v)-5 b(arian)m(t)24 b(of)h(this)h(elliptic)d(curv)m(e)28 b(is)d(16384)p Fs(=)p Ft(5,)h(and)g(it)f(has)h(a)g(mo)s(del)e(o)m(v)m(er)j Fz(Q)f Ft(in)g(W)-8 b(eierstrass)-118 1421 y(form)31 b(with)h(a)h(rational)d(p)s(oin)m(t)i(\()p Fo(\000)p Ft(1)p Fs(;)17 b Ft(1\))32 b(of)g(order)g(6:)1274 1590 y SDict begin H.S end 1274 1590 a 1274 1590 a SDict begin 14 H.A end 1274 1590 a 1274 1590 a SDict begin [/View [/XYZ H.V]/Dest (equation.4.1) cvn /DEST pdfmark end 1274 1590 a Fs(E)i Ft(:)111 b Fs(y)1570 1549 y Fr(2)1636 1590 y Ft(=)28 b Fs(x)p Ft(\()p Fs(x)1888 1549 y Fr(2)1950 1590 y Ft(+)22 b Fs(x)h Fo(\000)f Ft(1\))p Fs(:)-2457 b Ft(\(1\))-118 1759 y(The)38 b(elliptic)c(curv)m(e)39 b Fs(E)k Ft(has)37 b(conductor)h(20.)56 b(Asso)s(ciated)38 b(w)m(e)g(\014nd)f(a)g(cusp)h(form)e(of)h(w)m(eigh)m(t)g(2)g(and)g(lev) m(el)-118 1875 y(20:)223 2003 y Fs(f)i Ft(=)27 b Fs(q)f Fo(\000)d Ft(2)p Fs(q)678 1961 y Fr(3)739 2003 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Ft(\))23 b(admit)e(a)i(big)f(automorphism)f(group.)41 b(Immediately)21 b(visible)h(are)h Fs(r)j Ft(copies)d(of)g Fz(Z)p Fs(=)p Ft(2)p Fz(Z)g Ft(whic)m(h)h(allo)m(w)-118 2432 y(us)39 b(to)g(break)h(up)f(the)g(Jacobian)f(substan)m(tially)-8 b(.)61 b(Additional)37 b(symmetries)h(induce)i(further)f(in)m(v)m (olutions)-118 2548 y(whic)m(h)d(allo)m(w)e(a)h(further)h(decomp)s (osition)e(of)h(the)h(Jacobians.)53 b(In)36 b(fact,)g(w)m(e)h(v)m (eri\014ed)f(that)g(the)g(Jacobians)-118 2665 y(alw)m(a)m(ys)25 b(decomp)s(ose)g(in)m(to)e(pro)s(ducts)j(of)e(elliptic)d(curv)m(es)27 b(o)m(v)m(er)e(the)g(\014xed)h(extension)f Fz(Q)p Ft(\()p Fs(i;)17 b(\020)8 b Ft(\).)40 b(The)25 b(follo)m(wing)-118 2781 y(table)36 b(lists)g(these)j(elliptic)34 b(curv)m(es)39 b(with)d(their)h(j-in)m(v)-5 b(arian)m(ts,)37 b(the)g(conductor)h(of)e (some)h(preferred)h(mo)s(del)-118 2899 y(o)m(v)m(er)c Fz(Q)e Ft(or)g Fz(Q)p Ft(\()448 2816 y Fo(p)p 532 2816 49 4 v 532 2899 a Ft(5)o(\))h(\(suc)m(h)h(as)f(\()1067 2899 y SDict begin H.S end 1067 2899 a Ft(1)1115 2835 y SDict begin H.R end 1115 2835 a 1115 2899 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (equation.4.1) cvn H.B /ANN pdfmark end 1115 2899 a Ft(\)\))g(and)f(the)h(corresp)s(onding)g (automorphic)e(form.)p 738 3090 2303 4 v 992 3171 a(j-in)m(v)-5 b(arian)m(t)294 b(conductor)84 b(automorphic)31 b(form)p 738 3209 V 1057 3291 a(2)1106 3254 y Fr(11)1181 3291 y Ft(3)1230 3254 y Fr(3)1269 3291 y Fs(=)p Ft(5)523 b(40)603 b Fs(g)1013 3407 y Ft(2)1062 3371 y Fr(14)1137 3407 y Ft(31)1235 3371 y Fr(3)1274 3407 y Fs(=)p Ft(5)1372 3371 y Fr(3)1890 3407 y Ft(80)488 b Fs(f)33 b Fo(\012)22 b Fs(\037)2717 3422 y Fr(4)1011 3523 y Ft(2)1060 3487 y Fr(4)1099 3523 y Ft(3)1148 3487 y Fr(3)1188 3523 y Ft(7)1237 3487 y Fr(3)1276 3523 y Fs(=)p Ft(5)1374 3487 y Fr(2)1890 3523 y Ft(40)603 b Fs(g)p 738 3561 V 857 3652 a Ft(2)906 3615 y Fr(7)945 3652 y Ft(\(25)22 b Fo(\000)g Ft(11)1300 3569 y Fo(p)p 1383 3569 49 4 v 83 x Ft(5\))p Fs(=)p Ft(5)322 b(40)602 b Ff(h)780 3777 y Ft(8\(8903)21 b(+)h(3333)1378 3694 y Fo(p)p 1460 3694 V 1460 3777 a Ft(5\))p Fs(=)p Ft(5)245 b(80)491 b Ff(h)22 b Fo(\012)h Fs(\037)2714 3792 y Fr(4)p 738 3815 2303 4 v -18 4061 a Ft(Here)28 b Fs(g)j Ft(=)d Fs(q)17 b Ft(+)c Fs(q)585 4024 y Fr(5)637 4061 y Fo(\000)g Ft(4)p Fs(q)823 4024 y Fr(7)875 4061 y Fo(\000)g Ft(3)p Fs(q)1061 4024 y Fr(9)1113 4061 y Ft(+)g(4)p Fs(q)1298 4024 y Fr(11)1385 4061 y Fo(\000)g Ft(2)p Fs(q)1571 4024 y Fr(13)1659 4061 y Ft(+)g(2)p Fs(q)1844 4024 y Fr(17)1931 4061 y Ft(+)g(4)p Fs(q)2116 4024 y Fr(19)2203 4061 y Ft(+)g(4)p Fs(q)2388 4024 y Fr(23)2475 4061 y Ft(+)g Fs(O)s Ft(\()p Fs(q)2727 4024 y Fr(25)2801 4061 y Ft(\))28 b(is)f(the)i(unique)f(normalised)-118 4177 y(newform)e(of)g(w)m(eigh)m(t)g(2)g(and)g(lev)m(el)g(40,)h(and)g Fs(\037)1552 4192 y Fr(4)1617 4177 y Ft(denotes)h(the)e(quadratic)g (Diric)m(hlet)e(c)m(haracter)j(of)f(conductor)-118 4293 y(4.)-18 4409 y(The)31 b(Hilb)s(ert)e(mo)s(dular)g(form)h Ff(h)g Ft(of)g(parallel)e(w)m(eigh)m(t)k(2)e(for)g Fz(Q)p Ft(\()2321 4327 y Fo(p)p 2404 4327 49 4 v 82 x Ft(5\))h(is)f(describ)s (ed)i(as)f(follo)m(ws.)41 b(Consider)-118 4533 y(the)31 b(newspace)i(inside)d Fs(S)810 4548 y Fr(2)850 4533 y Ft(\(\000)949 4548 y Fr(0)988 4533 y Ft(\(8)1075 4451 y Fo(p)p 1158 4451 V 82 x Ft(5)o(\)\).)43 b(A)31 b(simple)e(Magma)h (computation)f(rev)m(eals)j(that)e(it)g(has)h(dimension)-118 4649 y(3)37 b(and)g(is)g(generated)g(b)m(y)i(the)e(Hilb)s(ert)f(mo)s (dular)f(form)g(induced)j(b)m(y)g Fs(g)i Ft(and)e(a)e(pair)h(of)f (Galois-conjugate)-118 4765 y(Hilb)s(ert)23 b(mo)s(dular)g(forms)g (with)i(Hec)m(k)m(e)i(eigen)m(v)-5 b(alues)24 b(in)g Fz(Z)p Ft(.)41 b(Let)25 b Fs( )k Ft(denote)c(the)g(quadratic)g(Hec)m(k) m(e)i(c)m(haracter)-118 4883 y(of)j(conductor)445 4801 y Fo(p)p 528 4801 V 82 x Ft(5)h(and)g Fo(1)p Ft(-t)m(yp)s(e)f(0.)43 b(Twisting)30 b(the)i(t)m(w)m(o)f(Hilb)s(ert)f(mo)s(dular)e(forms)j(b)m (y)g Fs( )k Ft(results)d(in)e Ff(h)g Ft(and)p eop end end %%Page: 13 13 TeXDict begin HPSdict 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 -126 -32 a SDict begin H.S end -126 -32 a -126 -32 a SDict begin H.R end -126 -32 a -126 -32 a SDict begin [/View [/XYZ H.V]/Dest (page.13) cvn /DEST pdfmark end -126 -32 a 40 43 a Fp(TW)n(O)33 b(MODULI)f(SP)-6 b(A)n(CES)33 b(OF)g(ABELIAN)g(F)n(OURF)n(OLDS)e(WITH)i(AN)f(A)n(UTOMORPHISM)g(OF)h (ORDER)f(FIVE)81 b(13)-118 242 y Ft(its)28 b(Galois-conjugate.)40 b(W)-8 b(e)29 b(list)e(the)i(\014rst)h(few)f(Hec)m(k)m(e)i(eigen)m(v)-5 b(alues)29 b Fs(a)2479 257 y Fe(p)2545 242 y Ft(of)f Ff(h)h Ft(according)f(to)h(the)g(norm)f(N\()p Ff(p)p Ft(\))-118 358 y(of)k(the)h(prime)e(ideal)g Ff(p)p Ft(.)p 480 531 2821 4 v 521 613 a(N\()p Ff(p)p Ft(\))166 b(4)83 b(5)121 b(9)183 b(11)165 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Fs(x)p Ft(\()p Fs(x)1214 1527 y Fr(2)1276 1568 y Ft(+)22 b(9\(9)p Fs(u)1566 1527 y Fr(2)1627 1568 y Fo(\000)h Ft(58)p Fs(u)e Ft(+)h(9\)\()p Fs(u)f Ft(+)h(1\))2387 1527 y Fr(2)2426 1568 y Fs(x=)p Ft(4)g(+)g(8100\()p Fs(u)f Ft(+)h(1\))3195 1527 y Fr(2)3234 1568 y Fs(u)3290 1527 y Fr(2)3329 1568 y Ft(\))p Fs(:)-118 1729 y Ft(By)37 b(insp)s(ection)f(of)h(the)g(degrees)h(of)e(the)i(co)s (e\016cien)m(ts,)h Fs(J)9 b(ac)p Ft(\()p Fs(X)f Ft(\))36 b(is)h(a)f(K3)h(surface.)57 b(The)37 b(in)m(v)m(olution)f Fs(u)e Fo(7!)-118 1846 y Ft(1)p Fs(=u)41 b Ft(of)h(the)h(base)g (extends)h(to)e Fs(J)9 b(ac)p Ft(\()p Fs(X)f Ft(\))42 b(to)g(de\014ne)i(t)m(w)m(o)f(in)m(v)m(olutions)e(connected)j(b)m(y)f (the)g(h)m(yp)s(erelliptic)-118 1962 y(in)m(v)m(olution.)f(One)32 b(has)g(quotien)m(t)g(a)g(rational)d(elliptic)g(surface)k(with)e (reducible)h(\014b)s(ers)g(of)g(t)m(yp)s(e)g Fs(I)3502 1977 y Fr(6)3542 1962 y Fs(;)17 b(I)8 b(I)g(I)g Ft(.)42 b(In)-118 2078 y(consequence,)28 b(the)c(Mordell-W)-8 b(eil)20 b(rank)j(is)g(t)m(w)m(o.)41 b(By)24 b(the)f(Shio)s(da-T)-8 b(ate)22 b(form)m(ula)f(w)m(e)k(deduce)f Fs(\032)p Ft(\()p Fs(J)9 b(ac)p Ft(\()p Fs(X)f Ft(\)\))28 b Fo(\025)-118 2194 y Ft(19)k(as)h(required.)-118 2280 y SDict begin H.S end -118 2280 a -118 2280 a SDict begin 14 H.A end -118 2280 a -118 2280 a SDict begin [/View [/XYZ H.V]/Dest (subsection.7.2) cvn /DEST pdfmark end -118 2280 a 97 x Ft(7.2.)48 b Fz(2nd)38 b(K3)f(surface.)49 b Ft(The)33 b(other)g(in)m(v)m(olution)d(on)i Fs(J)9 b(ac)p Ft(\()p Fs(X)f Ft(\))32 b(is)g(a)g(Nikulin)e(in)m(v)m(olution;)h(its)h(quotien) m(t)g(is)-118 2493 y(an)e(elliptic)d(K3)j(surface)h Fs(X)902 2457 y Fm(0)955 2493 y Ft(with)e(singular)g(\014b)s(ers)i(of)e(t)m(yp)s (e)i Fs(I)2170 2508 y Fr(6)2210 2493 y Fs(;)17 b(I)2305 2457 y Fm(\003)2297 2517 y Fr(1)2344 2493 y Fs(;)g(I)8 b(I)g(I)2541 2457 y Fm(\003)2610 2493 y Ft(and)30 b(a)f(2-torsion)g (section.)43 b(In)30 b(the)-118 2609 y(new)j(parameter)f Fs(s)c Ft(=)g Fs(u)21 b Ft(+)h(1)p Fs(=u)p Ft(,)32 b(it)g(is)g(giv)m (en)g(as)313 2771 y SDict begin H.S end 313 2771 a 313 2771 a SDict begin 14 H.A end 313 2771 a 313 2771 a SDict begin [/View [/XYZ H.V]/Dest (equation.7.3) cvn /DEST pdfmark end 313 2771 a Fs(X)402 2730 y Fm(0)453 2771 y Ft(:)83 b Fs(y)615 2730 y Fr(2)681 2771 y Ft(=)28 b Fs(x)p Ft(\()p Fs(x)933 2730 y Fr(2)995 2771 y Ft(+)22 b(\(9)p Fs(s)g Fo(\000)g Ft(58\)\()p Fs(s)g Ft(+)g(2\))1774 2730 y Fr(2)1813 2771 y Ft(\()p Fs(s)g Fo(\000)h Ft(2\))p Fs(x=)p Ft(4)e(+)i(8100\()p Fs(s)e Ft(+)h(2\))2865 2730 y Fr(3)2904 2771 y Ft(\()p Fs(s)g Fo(\000)g Ft(2\))3196 2730 y Fr(2)3236 2771 y Ft(\))p Fs(:)-3419 b Ft(\(3\))-118 2932 y(W)-8 b(e)35 b(shall)e(use)i(that)f Fs(X)754 2896 y Fm(0)811 2932 y Ft(\014ts)h(in)m(to)f(a)g(Shio)s(da{Inose)g (structure;)i(more)e(precisely)h Fs(X)3035 2896 y Fm(0)3092 2932 y Ft(is)f(sandwic)m(hed)i(b)m(y)f(a)-118 3048 y(Kummer)j(surface)j (of)e(pro)s(duct)h(t)m(yp)s(e)h(b)m(y)g(means)e(of)h(Nikulin)e(in)m(v)m (olutions.)63 b(T)-8 b(o)40 b(see)h(this,)g(it)e(su\016ces)j(to)-118 3164 y(exhibit)27 b(an)g(elliptic)e(\014bration)h(on)h Fs(X)1259 3128 y Fm(0)1310 3164 y Ft(with)g(section)g(and)h(t)m(w)m(o)g (\014b)s(ers)g(of)f(t)m(yp)s(e)h Fs(I)8 b(I)2891 3128 y Fm(\003)2958 3164 y Ft(\(sometimes)26 b(also)h(called)-118 3280 y(Inose)42 b(p)s(encil\).)70 b(Abstractly)41 b(this)h(can)f(b)s(e) h(ac)m(hiev)m(ed)h(b)m(y)f(w)m(orking)g(out)f(disjoin)m(t)f(divisors)h (of)g(the)h(giv)m(en)-118 3397 y(Ko)s(daira)35 b(t)m(yp)s(e;)41 b(explicitly)-8 b(,)36 b(ho)m(w)m(ev)m(er,)41 b(the)c(linear)f(systems) j(in)m(v)m(olv)m(ed)e(can)h(b)s(ecome)f(quite)g(complicated,)-118 3513 y(so)c(w)m(e)g(pro)s(ceed)h(in)d(t)m(w)m(o)j(steps)g(b)m(y)f (extracting)g(one)f(\014b)s(er)h(of)f(t)m(yp)s(e)i Fs(I)8 b(I)2484 3477 y Fm(\003)2556 3513 y Ft(at)32 b(a)g(time.)-118 3598 y SDict begin H.S end -118 3598 a -118 3598 a SDict begin 14 H.A end -118 3598 a -118 3598 a SDict begin [/View [/XYZ H.V]/Dest (subsection.7.3) cvn /DEST pdfmark end -118 3598 a 97 x Ft(7.3.)48 b Fz(Alternativ)m(e)31 b(elliptic)e(\014bration.)49 b Ft(W)-8 b(e)29 b(start)g(b)m(y)g (extracting)f(a)h(singular)e(\014b)s(er)i(of)f(t)m(yp)s(e)h Fs(I)8 b(V)3632 3659 y Fm(\003)3700 3695 y Ft(from)-118 3812 y(the)37 b(ab)s(o)m(v)m(e)h(\014bration)f(as)g(follo)m(ws:)51 b(omit)35 b(the)j(opp)s(osite)f(comp)s(onen)m(t)g(of)f(the)i Fs(I)2859 3827 y Fr(6)2936 3812 y Ft(\014b)s(er)f(extended)i(b)m(y)f (zero)-118 3928 y(section)c(and)f(iden)m(tit)m(y)g(comp)s(onen)m(t)h (of)f(the)h Fs(I)1592 3892 y Fm(\003)1584 3952 y Fr(1)1665 3928 y Ft(\014b)s(er.)46 b(The)35 b(remaining)c(\014b)s(er)j(comp)s (onen)m(ts)g(disjoin)m(t)e(from)-118 4052 y(this)26 b(and)g(the)g (2-torsion)e(section)i(com)m(bine)g(for)f(divisors)h(of)f(t)m(yp)s(e) 2337 4027 y(~)2314 4052 y Fs(E)2386 4067 y Fr(8)2452 4052 y Ft(and)h Fs(A)2708 4067 y Fr(3)2747 4052 y Ft(,)i(and)e(there)h (still)c(is)j(a)f(section.)-118 4168 y(In)33 b(particular,)e(w)m(e)i (\014nd)705 4329 y(NS\()p Fs(X)959 4288 y Fm(0)982 4329 y Ft(\))28 b(=)g Fs(U)k Ft(+)22 b Fs(A)1421 4344 y Fr(3)1483 4329 y Ft(+)g Fs(E)1653 4344 y Fr(6)1715 4329 y Ft(+)g Fs(E)1885 4344 y Fr(8)2040 4329 y Ft(and)116 b Fs(T)14 b Ft(\()p Fs(X)2511 4288 y Fm(0)2533 4329 y Ft(\))28 b(=)g Fs(U)k Ft(+)22 b Fo(h)p Ft(12)p Fo(i)-118 4490 y Ft(\(the)33 b(latter)f(through)h(the)g(discriminan)m(t)e(form)g (after)i(Nikulin\).)42 b(In)33 b(terms)g(of)f(the)i(ab)s(o)m(v)m(e)f (mo)s(del)f(\()3616 4490 y SDict begin H.S end 3616 4490 a Ft(3)3664 4426 y SDict begin H.R end 3664 4426 a 3664 4490 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (equation.7.3) cvn H.B /ANN pdfmark end 3664 4490 a Ft(\),)h(the)-118 4606 y(new)40 b(\014bration)e(is)g(giv)m(en)h(b)m(y)h(the)f(elliptic)d (parameter)j Fs(u)f Ft(=)g Fs(x=)p Ft(\()p Fs(s)27 b Fo(\000)g Ft(2\).)62 b(After)39 b(rescaling)f Fs(u)g Ft(=)g(720)p Fs(=t)p Ft(,)i(a)-118 4723 y(W)-8 b(eierstrass)33 b(form)f(is)g(giv)m(en)g(b)m(y)295 4883 y Fs(X)384 4842 y Fm(0)435 4883 y Ft(:)83 b Fs(y)597 4842 y Fr(2)664 4883 y Ft(=)27 b Fs(x)822 4842 y Fr(3)884 4883 y Fo(\000)c Ft(216)p Fs(t)1166 4842 y Fr(3)1205 4883 y Ft(\(17)p Fs(t)f Fo(\000)g Ft(15\))p Fs(x)g Fo(\000)h Ft(27\(3375)p Fs(t)2177 4842 y Fr(3)2237 4883 y Fo(\000)g Ft(14393)p Fs(t)2617 4842 y Fr(2)2678 4883 y Ft(+)f(16965)p Fs(t)f Fo(\000)h Ft(6075\))p Fs(t)3445 4842 y Fr(4)p eop end end %%Page: 21 21 TeXDict begin HPSdict 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 -126 -32 a SDict begin H.S end -126 -32 a -126 -32 a SDict begin H.R end -126 -32 a -126 -32 a SDict begin [/View [/XYZ H.V]/Dest (page.21) cvn /DEST pdfmark end -126 -32 a 40 43 a Fp(TW)n(O)33 b(MODULI)f(SP)-6 b(A)n(CES)33 b(OF)g(ABELIAN)g(F)n(OURF)n(OLDS)e(WITH)i(AN)f(A)n(UTOMORPHISM)g(OF)h 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Ft(\014b)s(er)f(serv)m (es)j(as)e(a)f(section,)h(and)g(there)g(is)f(a)g(disjoin)m(t)-118 794 y(divisor)c(of)i(t)m(yp)s(e)g Fs(E)602 809 y Fr(8)674 794 y Ft(coming)e(from)h(the)h(original)c Fs(I)8 b(I)1863 758 y Fm(\003)1934 794 y Ft(\014b)s(er.)44 b(As)33 b(elliptic)d (parameter,)i(one)h(\014nds)523 1023 y Fs(u)27 b Ft(=)719 956 y Fs(y)f Ft(+)c Fs(t)p Ft(\()p Fs(x)g Fo(\000)h Ft(12)p Fs(t)1274 919 y Fr(2)1313 956 y Ft(\)\(4)f Fo(\000)h Ft(10)p Fs(t)p Ft(\))f(+)g Fs(t)1886 919 y Fr(2)1925 956 y Ft(\()p Fs(t)g Fo(\000)h Ft(1\)\(1125)p Fs(t)2476 919 y Fr(2)2537 956 y Ft(+)f(225)p Fs(t)f Fo(\000)i Ft(810\))p Fs(=)p Ft(2)p 719 1000 2501 4 v 1772 1091 a Fs(t)1807 1063 y Fr(4)1846 1091 y Ft(\()p Fs(t)g Fo(\000)f Ft(1\))2128 1063 y Fr(2)3230 1023 y Fs(:)-118 1249 y Ft(After)41 b(some)h(co)s(ordinate)e(transformations)g(o)m(v)m(er)i Fz(Q)p Ft(,)i(this)d(leads)g(to)g(the)h(W)-8 b(eierstrass)42 b(form)e(of)h(Inose's)-118 1365 y(p)s(encil)519 1536 y SDict begin H.S end 519 1536 a 519 1536 a SDict 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b(can)f(easily)g(compute)h(the)g(j-in)m(v)-5 b(arian)m(ts)31 b(as)1209 1995 y Fs(j)j Ft(=)27 b(16384)p Fs(=)p Ft(5)p Fs(;)98 b(j)1900 1954 y Fm(0)1951 1995 y Ft(=)28 b Fo(\000)p Ft(2)2181 1954 y Fr(4)2221 1995 y Ft(109)2368 1954 y Fr(3)2406 1995 y Fs(=)p Ft(5)2504 1954 y Fr(6)2543 1995 y Fs(:)-118 2166 y Ft(Note)44 b(that)h Fs(j)50 b Ft(is)44 b(the)h(j-in)m(v)-5 b(arian)m(t)42 b(of)i Fs(E)50 b Ft(from)1703 2166 y SDict begin H.S end 1703 2166 a Ft(4.5)1828 2102 y SDict begin H.R end 1828 2102 a 1828 2166 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (subsection.4.5) cvn H.B /ANN pdfmark end 1828 2166 a Ft(,)d(and)e Fs(j)2150 2130 y Fm(0)2217 2166 y Ft(describ)s(es)h(an)e(elliptic)e (curv)m(e)k Fs(E)3474 2130 y Fm(0)3541 2166 y Ft(whic)m(h)f(is)-118 2283 y(6-isogenous)32 b(to)g Fs(E)6 b Ft(.)44 b(W)-8 b(e)33 b(shall)e(no)m(w)i(w)m(ork)g(out)g(the)g(ab)s(o)m(v)m(e)g (corresp)s(ondence)i(o)m(v)m(er)f Fz(Q)p Ft(.)-118 2389 y SDict begin H.S end -118 2389 a -118 2389 a SDict begin 14 H.A end -118 2389 a -118 2389 a SDict begin [/View [/XYZ H.V]/Dest (subsection.7.5) cvn /DEST pdfmark end -118 2389 a 97 x Ft(7.5.)48 b Fz(Kummer)43 b(surface.)50 b Ft(Recall)37 b(that)i Fs(E)45 b Ft(has)39 b(a)f(rational)e(6-torsion)h (p)s(oin)m(t.)61 b(The)40 b(corresp)s(onding)e(6-)-118 2602 y(isogen)m(y)33 b(leads)f(to)h(the)g(minimal)28 b(mo)s(del)j(of)h Fs(E)1614 2566 y Fm(0)1637 2602 y Ft(:)1220 2773 y Fs(E)1298 2732 y Fm(0)1349 2773 y Ft(:)84 b Fs(y)1512 2732 y Fm(0)p Fr(2)1597 2773 y Ft(=)27 b Fs(x)1755 2732 y Fm(0)1779 2773 y Ft(\()p Fs(x)1872 2732 y Fm(0)p Fr(2)1953 2773 y Ft(+)22 b(22)p Fs(x)2204 2732 y Fm(0)2250 2773 y Ft(+)g(125\))p Fs(:)-118 2945 y Ft(The)33 b(Kummer)f(surface)h(Km)o (\()p Fs(E)c Fo(\002)22 b Fs(E)1290 2909 y Fm(0)1313 2945 y Ft(\))33 b(can)g(b)s(e)g(giv)m(en)f(as)h(cubic)g(p)s(encil)722 3117 y(Km)o(\()p Fs(E)28 b Fo(\002)22 b Fs(E)1194 3076 y Fm(0)1218 3117 y Ft(\))27 b(:)111 b Fs(x)p Ft(\()p Fs(x)1569 3076 y Fr(2)1632 3117 y Ft(+)22 b Fs(x)g Fo(\000)h Ft(1\))p Fs(t)2029 3076 y Fr(2)2096 3117 y Ft(=)k Fs(x)2254 3076 y Fm(0)2278 3117 y Ft(\()p Fs(x)2371 3076 y Fm(0)p Fr(2)2452 3117 y Ft(+)22 b(22)p Fs(x)2703 3076 y Fm(0)2749 3117 y Ft(+)g(125\))p Fs(:)-118 3288 y Ft(Here)30 b(pro)5 b(jection)29 b(on)m(to)g(the)h Fs(t)p Ft(-line)e(induces)i(an)f (elliptic)d(\014bration)j(with)g(\014b)s(ers)h(of)f(t)m(yp)s(e)h Fs(I)8 b(V)3316 3252 y Fm(\003)3385 3288 y Ft(at)29 b(0)p Fs(;)17 b Fo(1)p Ft(.)41 b(W)-8 b(e)-118 3404 y(c)m(ho)s(ose)33 b(the)g(base)h(p)s(oin)m(t)d(\(0)p Fs(;)17 b Ft(0\))32 b(of)g(the)h(cubics)g(as)g(zero)g(section)g(and)f(compute)h(the)g(W)-8 b(eierstrass)33 b(form)748 3577 y Fs(y)800 3536 y Fr(2)866 3577 y Ft(=)28 b Fs(x)1025 3536 y Fr(3)1087 3577 y Fo(\000)22 b Ft(436)p Fs(t)1368 3536 y Fr(4)1407 3577 y Fs(x=)p Ft(3)h(+)f Fs(t)1716 3536 y Fr(4)1755 3577 y Ft(\(5)p Fs(t)1877 3536 y Fr(4)1917 3577 y Fs(=)p Ft(4)f Fo(\000)i Ft(18997)p Fs(t)2416 3536 y Fr(2)2454 3577 y Fs(=)p Ft(27)f Fo(\000)h Ft(62500\))p Fs(:)-118 3748 y Ft(This)39 b(is)f(exactly)h (the)f(quadratic)h(base)g(c)m(hange)g(of)f(the)h(Inose)h(p)s(encil)d (\()2602 3748 y SDict begin H.S end 2602 3748 a Ft(4)2651 3684 y SDict begin H.R end 2651 3684 a 2651 3748 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (equation.7.4) cvn H.B /ANN pdfmark end 2651 3748 a Ft(\))h(on)h Fs(X)2958 3712 y Fm(0)3019 3748 y Ft(alluded)f(to)g(in)3612 3748 y SDict begin H.S end 3612 3748 a Ft(7.4)3736 3684 y SDict begin H.R end 3736 3684 a 3736 3748 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (subsection.7.4) cvn H.B /ANN pdfmark end 3736 3748 a Ft(.)62 b(It)-118 3864 y(follo)m(ws)37 b(that)g(all)f(K3)i (surfaces)h Fs(X)r(;)17 b(X)1316 3828 y Fm(0)1377 3864 y Ft(and)38 b(Km)o(\()p Fs(E)32 b Fo(\002)26 b Fs(E)2052 3828 y Fm(0)2075 3864 y Ft(\))38 b(share)h(the)f(same)g(transcenden)m (tal)h(motiv)m(e)e Fs(V)-118 3980 y Ft(o)m(v)m(er)32 b Fz(Q)p Ft(.)43 b(Since)30 b Fs(E)37 b Ft(and)30 b Fs(E)869 3944 y Fm(0)923 3980 y Ft(are)h(isogenous)g(o)m(v)m(er)g Fz(Q)g Ft(\(and)g(non-CM\),)g(w)m(e)g(ha)m(v)m(e)h(in)e(fact)g Fs(V)50 b Ft(=)27 b(Sym)17 b Fs(H)3678 3944 y Fr(1)3717 3980 y Ft(\()p Fs(E)6 b Ft(\).)-118 4097 y(This)33 b(concludes)g(the)g (pro)s(of)f(of)g(Theorem)1490 4097 y SDict begin H.S end 1490 4097 a Ft(6.8)1614 4032 y SDict begin H.R end 1614 4032 a 1614 4097 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (subsection.6.8) cvn H.B /ANN pdfmark end 1614 4097 a Ft(.)2179 b Fg(\003)-118 4203 y SDict begin H.S end -118 4203 a -118 4203 a SDict begin 14 H.A end -118 4203 a -118 4203 a SDict begin [/View [/XYZ H.V]/Dest (subsection.7.6) cvn /DEST pdfmark end -118 4203 a 97 x Ft(7.6.)48 b Fz(Remark.)h Ft(Note)30 b(that)f(the)h(T)-8 b(ate)30 b(conjecture)h(is)e(kno)m(wn)i (for)e(elliptic)e(K3)i(surfaces)i(with)f(section.)42 b(In)-118 4419 y(the)c(presen)m(t)h(situation,)e(w)m(e)i(deduce)g(that) e(the)h(T)-8 b(ate)38 b(conjecture)h(holds)e(for)2841 4394 y(~)2825 4419 y Fs(S)6 b Ft(.)58 b(A)m(t)38 b(a)f(prime)f Fs(p)i Ft(of)f(go)s(o)s(d)-118 4535 y(reduction,)c(w)m(e)g(\014nd)668 4792 y Fs(\032)p Ft(\()773 4767 y(~)756 4792 y Fs(S)28 b Fo(\012)955 4767 y Ft(\026)944 4792 y Fz(F)1014 4807 y Fq(p)1054 4792 y Ft(\))g(=)1223 4622 y Fl(\()1304 4725 y Ft(51)129 b(if)32 b Fs(E)38 b Ft(has)33 b(ordinary)f(reduction)h(at)f Fs(p)p Ft(;)1304 4865 y(61)97 b(if)31 b Fs(E)39 b Ft(has)33 b(sup)s(ersingular)f(reduction)g(at)g Fs(p:)p eop end end %%Page: 22 22 TeXDict begin HPSdict begin 22 21 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 -126 -32 a SDict begin H.S end -126 -32 a -126 -32 a SDict begin H.R end -126 -32 a 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Fs(\020)d Fo(\000)26 b Fs(\020)593 3064 y Fm(\000)p Fr(1)722 3100 y Fo(2)37 b Fz(Z)p Ft([)p Fs(\020)8 b Ft(])36 b(=)f Fs(E)6 b(nd)p Ft(\()p Fs(B)1444 3115 y Fr(0)1484 3100 y Ft(\).)58 b(This)37 b(isogen)m(y)h(induces)h(a)e(homomorphism)d(on)k(the)g(p)s(erio)s(d) -118 3217 y(lattice,)29 b(giv)m(en)g(b)m(y)i(the)f(2)16 b Fo(\002)g Ft(2)29 b(matrix)f(\011)f Fo(2)h Fs(M)1595 3232 y Fr(2)1635 3217 y Ft(\()p Fz(Z)p Ft([)p Fs(\020)8 b Ft(]\).)42 b(One)30 b(easily)f(c)m(hec)m(ks)j(that)d(there)h(is)f(a)h (comm)m(utativ)m(e)-118 3333 y(diagram)g(\(note)j(that)f Fs(\016)774 3297 y Fr(2)841 3333 y Ft(=)c Fo(\000)p Ft(3)22 b Fo(\000)h Fs(\021)t Ft(\):)88 3528 y Fz(Z)p Ft([)p Fs(\020)8 b Ft(])261 3492 y Fr(2)453 3472 y(\011)400 3528 y Fo(\000)-16 b(!)99 b Fz(Z)p Ft([)p Fs(\020)8 b Ft(])833 3492 y Fr(2)95 3659 y Fq(M)170 3679 y Fo(#)521 b(#)791 3659 y Fr(2\010)877 3668 y Fh(0)88 3836 y Fz(Z)p Ft([)p Fs(\020)8 b Ft(])261 3800 y Fr(2)453 3780 y(\011)400 3836 y Fo(\000)-16 b(!)99 b Fz(Z)p Ft([)p 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Ft(,)j(for)c(the)h(deformations)e Fs(J)54 b Ft(of)45 b(the)h(complex)-118 4289 y(structure)28 b Fs(J)348 4304 y Fr(0)413 4289 y Ft(as)f(ab)s(o)m(v)m(e.)42 b(T)-8 b(o)27 b(see)g(this,)h(w)m(e)f(use)h(the)f(iden)m(ti\014cation)e (of)g(NS)q(\()p Fs(B)2734 4253 y Fr(2)2729 4314 y(0)2773 4289 y Ft(\))i(with)f(the)h(Rosati-in)m(v)-5 b(arian)m(t)-118 4406 y(endomorphisms)35 b Fs(E)6 b(nd)767 4370 y Fq(s)804 4406 y Ft(\()p Fs(B)921 4370 y Fr(2)916 4431 y(0)960 4406 y Ft(\))34 b Fo(\032)g Fs(M)1237 4421 y Fr(2)1277 4406 y Ft(\()p Fz(Z)p Ft([)p Fs(\020)8 b Ft(]\))35 b(\([)1626 4406 y SDict begin H.S end 1626 4406 a Ft(BL)1756 4338 y SDict begin H.R end 1756 4338 a 1756 4406 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.BL) cvn H.B /ANN pdfmark end 1756 4406 a Ft(],)i(Prop.)g(5.2.1\))e(giv)m(en)h(b)m(y)h Fs(L)d Fo(7!)f Fs(\036)3080 4365 y Fm(\000)p Fr(1)3080 4433 y Fq(L)3128 4442 y Fh(0)3174 4406 y Fs(\036)3232 4421 y Fq(L)3320 4406 y Ft(where)38 b Fs(L)3672 4421 y Fr(0)3747 4406 y Ft(is)e(a)-118 4530 y(line)25 b(bundle)i(on)g Fs(B)583 4494 y Fr(2)578 4554 y(0)650 4530 y Ft(with)f(Chern)i(class)f (the)g(principal)e(p)s(olarisation)e Fs(E)2539 4545 y Fr(0)2590 4530 y Fo(\010)10 b Fs(E)2749 4545 y Fr(0)2789 4530 y Ft(.)42 b(As)27 b Fs(E)3068 4545 y Fr(0)3118 4530 y Fo(\010)10 b Fs(E)3277 4545 y Fr(0)3344 4530 y Ft(also)26 b(de\014nes)j(a)-118 4646 y(principal)i(p)s(olarisation)e(on)k Fs(B)1038 4610 y Fr(2)1077 4646 y Ft(,)g(w)m(e)h(get)f(an)g(iden)m (ti\014cation)e(of)h(NS)q(\()p Fs(B)2524 4610 y Fr(2)2563 4646 y Ft(\))h(with)f Fs(E)6 b(nd)3043 4610 y Fq(s)3080 4646 y Ft(\()p Fs(B)3197 4610 y Fr(2)3236 4646 y Ft(\))28 b Fo(\032)h Fs(M)3502 4661 y Fr(2)3542 4646 y Ft(\()p Fz(Z)p Ft([)p Fs(\021)t Ft(]\))f Fo(\032)-118 4762 y Fs(M)-24 4777 y Fr(2)16 4762 y Ft(\()p Fz(Z)p Ft([)p Fs(\020)8 b Ft(]\).)63 b(The)40 b(Rosati)e(in)m(v)m(olution)f(for)i(an) g(endomorphism)f(de\014ned)j(b)m(y)f(a)f(matrix)f(\012)h Fo(2)g Fs(M)3504 4777 y Fr(2)3544 4762 y Ft(\()p Fz(Z)p Ft([)p Fs(\020)8 b Ft(]\))39 b(is)-118 4883 y(giv)m(en)28 b(b)m(y)h(\012)g Fo(7!)e Ft(\012)559 4847 y Fm(0)627 4883 y Ft(=)747 4847 y Fq(t)p 777 4803 71 4 v 777 4883 a Ft(\012)h(\(the)h(complex)f(conjugation)f(comes)h(from)f([)2515 4883 y SDict begin H.S end 2515 4883 a Ft(BL)2645 4815 y SDict begin H.R end 2645 4815 a 2645 4883 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.BL) cvn H.B /ANN pdfmark end 2645 4883 a Ft(],)j(Lemma)c(5.5.4,)j(the)g(transp)s(ose)p eop end end %%Page: 23 23 TeXDict begin HPSdict begin 23 22 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 -126 -32 a SDict begin H.S end -126 -32 a -126 -32 a SDict begin H.R end -126 -32 a -126 -32 a SDict begin [/View [/XYZ H.V]/Dest (page.23) cvn /DEST pdfmark end -126 -32 a 40 43 a Fp(TW)n(O)33 b(MODULI)f(SP)-6 b(A)n(CES)33 b(OF)g(ABELIAN)g(F)n(OURF)n(OLDS)e(WITH)i(AN)f(A)n(UTOMORPHISM)g(OF)h (ORDER)f(FIVE)81 b(23)-118 268 y Ft(comes)30 b(from)f(pull-bac)m(k)g (of)g(line)f(bundles)j(on)1602 234 y Fl(c)1593 268 y Fs(B)1672 234 y Fr(2)1667 292 y(0)1739 268 y Ft(=)c Fs(P)14 b(ic)1994 232 y Fr(0)2034 268 y Ft(\()p Fs(B)2151 232 y Fr(2)2146 293 y(0)2190 268 y Ft(\),)30 b(the)h(dual)e(of)g Fs(B)2852 232 y Fr(2)2847 293 y(0)2892 268 y Ft(\).)42 b(As)31 b(w)m(e)f(use)h Fs(E)3519 283 y Fr(0)3575 268 y Fo(\010)17 b Fs(E)3741 283 y Fr(0)3811 268 y Ft(to)-118 384 y(de\014ne)31 b(the)f(Rosati)e(in)m(v)m(olution,)h(this)g(p)s (olarisation)d(corresp)s(onds)31 b(to)e(the)h(iden)m(tit)m(y)g(in)e Fs(E)6 b(nd)p Ft(\()p Fs(B)3414 348 y Fr(2)3409 409 y(0)3454 384 y Ft(\))29 b(and)h(then)-118 505 y(\011)-42 469 y Fm(\003)-3 505 y Ft(\()p Fs(E)107 520 y Fr(0)166 505 y Fo(\010)19 b Fs(E)334 520 y Fr(0)374 505 y Ft(\))30 b(corresp)s(onds)j(to)d Fs( )1160 469 y Fm(0)1156 530 y Fr(0)1196 505 y Fs( )1259 520 y Fr(0)1330 505 y Ft(b)m(y)i([)1491 505 y SDict begin H.S end 1491 505 a Ft(BL)1621 437 y SDict begin H.R end 1621 437 a 1621 505 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.BL) cvn H.B /ANN pdfmark end 1621 505 a Ft(],)f(Lemma)f(5.2.6.)42 b(One)32 b(easily)e(computes)h (that)3437 469 y Fq(t)p 3467 425 76 4 v 3467 505 a Ft(\011\011)f(lies)g (in)-118 622 y Fs(M)-24 637 y Fr(2)16 622 y Ft(\()p Fz(Z)p Ft([)p Fs(\021)t Ft(]\),)h(hence)g(the)g(p)s(olarisation)c(\011)1366 585 y Fm(\003)1405 622 y Ft(\()p Fs(E)1515 637 y Fr(0)1572 622 y Fo(\010)18 b Fs(E)1739 637 y Fr(0)1779 622 y Ft(\))30 b(deforms)g(to)g(the)g(class)h(of)e(a)h(line)f(bundle)i Fs(L)f Ft(on)g Fs(B)3715 585 y Fr(2)3755 622 y Ft(.)43 b(It)-118 738 y(is)32 b(still)e(a)i(p)s(olarisation,)e(since)j(this)f (is)g(an)h(op)s(en)f(condition)g(\(one)g(no)m(w)i(only)e(needs)i Fs(E)6 b Ft(\()p Fs(v)t(;)17 b(J)9 b(v)t Ft(\))27 b Fs(>)g Ft(0\).)-18 854 y(Giv)m(en)37 b(a)g(deformation)f Fs(B)42 b Ft(of)37 b Fs(B)1211 869 y Fr(0)1288 854 y Ft(as)h(ab)s(o)m(v)m(e,)h (w)m(e)g(de\014ne)f(an)g(ab)s(elian)d(v)-5 b(ariet)m(y)37 b Fs(A)h Ft(as)g(the)f(image)f(of)h Fs(B)3858 818 y Fr(2)-118 970 y Ft(under)46 b(the)f(isogen)m(y)g(determined)g(b)m(y)h(the)f (matrix)f(\011.)80 b(In)45 b(particular,)i(as)e Fs(B)50 b Ft(is)44 b(the)i(quotien)m(t)f(of)f(the)-118 1087 y(complex)g(space)i (\()p Fs(V)5 b(;)17 b(J)9 b Ft(\))44 b(b)m(y)h Fz(Z)p Ft([)p Fs(\020)8 b Ft(],)48 b(w)m(e)d(can)g(iden)m(tify)f Fs(A)h Ft(with)f(the)h(quotien)m(t)f(of)g(\()p Fs(V)5 b(;)17 b(J)9 b Ft(\))3242 1050 y Fr(2)3326 1087 y Ft(b)m(y)46 b(the)f(larger)-118 1203 y(lattice)39 b(\011)264 1167 y Fm(\000)p Fr(1)358 1203 y Ft(\()p Fz(Z)p Ft([)p Fs(\020)8 b Ft(])569 1167 y Fr(2)608 1203 y Ft(\).)67 b(As)42 b Fs( )956 1218 y Fr(0)995 1203 y Ft(\()p Fs(B)1112 1167 y Fr(2)1107 1227 y(0)1152 1203 y Ft(\))f(=)g Fs(B)1427 1167 y Fr(2)1422 1227 y(0)1467 1203 y Ft(,)h(the)f(ab)s(elian)e(v)-5 b(ariet)m(y)40 b Fs(A)h Ft(is)f(also)f(a)i(deformation)d(of)i Fs(B)3652 1167 y Fr(2)3647 1227 y(0)3692 1203 y Ft(.)67 b(As)-118 1319 y Fs(E)-46 1334 y Fr(0)20 1319 y Fo(\010)26 b Fs(E)195 1334 y Fr(0)274 1319 y Ft(pulls)37 b(bac)m(k)j(along)d(\011) h(to)h(a)f(p)s(olarisation)d(on)k Fs(B)2101 1283 y Fr(2)2140 1319 y Ft(,)i(it)c(de\014nes)j(a)f(p)s(olarisation)c(on)k Fs(A)p Ft(,)h(whic)m(h)f(is)-118 1435 y(principal)e(since)j(it)e(is)h (so)h(on)f Fs(B)1098 1399 y Fr(2)1093 1460 y(0)1137 1435 y Ft(.)64 b(The)40 b(diagram)d(sho)m(ws)k(that)e Fs(A)h Ft(has)g(an)f(endomorphism)f(induced)i(b)m(y)-118 1585 y(2\010)1 1600 y Fr(0)41 1585 y Ft(.)i(This)31 b(endomorphism)e (factors)i(o)m(v)m(er)g(the)g(m)m(ultiplication)26 b(b)m(y)32 b(t)m(w)m(o)f(map)f(on)g Fs(A)p Ft(,)h Fs(A)3256 1528 y Fr(2)3193 1585 y Fo(\000)-16 b(!)27 b Fs(A)3511 1524 y Fq(\036)3482 1585 y Fo(!)g Fs(A)p Ft(,)k(and)-118 1701 y(in)j(this)g(w)m(a)m(y)j(it)c(de\014nes)k(an)e(endomorphism)e(of)i Fs(\036)p Ft(,)g(whic)m(h)g(is)g(of)f(course)i(induced)f(b)m(y)h(\010) 3212 1716 y Fr(0)3252 1701 y Ft(.)50 b(In)35 b(particular,)-118 1817 y(\()p Fs(A;)17 b(\036)p Ft(\))32 b(is)g(a)g(deformation)f(of)h (\()p Fs(B)1117 1781 y Fr(2)1112 1842 y(0)1156 1817 y Fs(;)17 b(\036)1258 1832 y Fr(0)1297 1817 y Ft(\).)-18 1934 y(In)23 b(this)g(w)m(a)m(y)i(w)m(e)f(obtain)f(a)g(t)m(w)m(o)h (dimensional)d(\(parametrised)h(b)m(y)j Fz(H)2497 1949 y Fr(1)2539 1934 y Fo(\002)s Fz(H)2707 1949 y Fr(1)2747 1934 y Ft(\))e(family)e(of)i(ab)s(elian)f(fourfolds)-118 2050 y(with)48 b(automorphism)d(of)j(order)g(\014v)m(e)i(\()p Fs(A;)17 b(\036)p Ft(\))47 b(whic)m(h)i(are)f(deformations)e(of)i(\()p Fs(A)2979 2065 y Fr(0)3018 2050 y Fs(;)17 b(\036)3120 2065 y Fr(0)3159 2050 y Ft(\).)90 b(On)48 b(the)g(other)-118 2178 y(hand,)43 b(the)f(p)s(oin)m(ts)e(in)h(the)g(Shim)m(ura)f(surface) i Fs(S)48 b Fo(\032)p 1900 2091 337 4 v 42 w(A)1980 2193 y Fr(4)2019 2178 y Ft(\(2)p Fs(;)17 b Ft(4\))40 b(also)g(parametrise)h (principally)d(p)s(olarised)-118 2294 y(ab)s(elian)24 b(fourfolds)i Fs(A)g Ft(with)g(an)h(automorphism)d Fs(\036)i Ft(whic)m(h)h(are)f(deformations)f(of)h(\()p Fs(A)3000 2309 y Fr(0)3040 2294 y Fs(;)17 b(\036)3142 2309 y Fr(0)3181 2294 y Ft(\).)41 b(These)28 b(surfaces)-118 2410 y(therefore)j (coincide)f(and)h(th)m(us)h Fs(S)37 b Ft(is)30 b(dominated)g(b)m(y)h(a) g(Hilb)s(ert)e(mo)s(dular)g(surface)i(b)s(elonging)e(to)i(the)g (\014eld)-118 2528 y Fz(Q)p Ft(\()p Fs(\020)8 b Ft(\).)39 b(The)24 b(precise)g(subgroup)f(\000)g(of)f(SL)1374 2543 y Fr(2)1414 2528 y Ft(\()p Fz(Q)p Ft(\()1574 2446 y Fo(p)p 1657 2446 49 4 v 82 x Ft(5\)\))g(suc)m(h)j(that)d Fs(S)29 b Ft(is)22 b(the)i(compacti\014cation)c(of)j(\000)p Fo(n)p Ft(\()p Fz(H)3612 2543 y Fr(1)3653 2528 y Fo(\002)r Fz(H)3820 2543 y Fr(1)3860 2528 y Ft(\))-118 2644 y(can,)33 b(in)f(principle,)f (b)s(e)i(determined)f(from)f(the)i(data)g(giv)m(en)f(here.)-118 2725 y SDict begin H.S end -118 2725 a -118 2725 a SDict begin 14 H.A end -118 2725 a -118 2725 a SDict begin [/View [/XYZ H.V]/Dest (subsection.8.2) cvn /DEST pdfmark end -118 2725 a 97 x Ft(8.2.)48 b Fz(Mumford-T)-9 b(ate)38 b(groups.)50 b Ft(W)-8 b(e)33 b(brie\015y)f(review)i(the)f(Mumford-T)-8 b(ate)32 b(groups)h(of)f(the)h(ab)s(elian)d(v)-5 b(a-)-118 2938 y(rieties)25 b(considered)j(here.)42 b(This)27 b(pro)m(vides)g (another)f(w)m(a)m(y)i(to)e(see)h(that)g(the)f(Shim)m(ura)g(surface)h (is)f(dominated)-118 3054 y(b)m(y)e(a)g(Hilb)s(ert)e(mo)s(dular)f (surface)j(and,)i(in)d(principle,)h(it)e(allo)m(ws)h(one)h(to)f (determine)g(the)h(co)s(compact)f(discrete)-118 3171 y(subgroup)33 b(\000)g(of)f Fs(S)6 b(L)p Ft(\(2)p Fs(;)17 b Fz(R)p Ft(\))31 b(suc)m(h)j(that)f(\000)p Fo(n)p Fz(H)1557 3186 y Fr(1)1628 3171 y Ft(is)f(isomorphic)f(to)h(the)h(Shim)m(ura)f (curv)m(e.)-18 3287 y(Let)f(\()p Fs(X)r(;)17 b(L;)g(\036)p Ft(\))31 b(b)s(e)h(a)f(four)g(dimensional)e(ppa)m(v)j(with)f(an)g (automorphism)e Fs(\036)i Ft(of)g(order)h(\014v)m(e)g(as)g(in)e (section)-118 3403 y SDict begin H.S end -118 3403 a Ft(1.1)7 3339 y SDict begin H.R end 7 3339 a 7 3403 a SDict begin [/Color [1 0 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (subsection.1.1) cvn H.B /ANN pdfmark end 7 3403 a Ft(.)68 b(Then)42 b Fs(X)496 3375 y Fo(\030)497 3407 y Ft(=)615 3403 y(\(\003)28 b Fo(\012)g Fz(R)p Ft(\))p Fs(=)p Ft(\003)40 b(where)i(\003)1533 3375 y Fo(\030)1534 3407 y Ft(=)1652 3403 y Fz(Z)p Ft([)p Fs(\020)8 b Ft(])1825 3367 y Fr(2)1905 3403 y Ft(and)42 b(the)f(action)f(of)g Fs(\036)h Ft(on)g(\003)3053 3375 y Fo(\030)3053 3407 y Ft(=)3172 3403 y Fz(Z)p Ft([)p Fs(\020)8 b Ft(])3345 3367 y Fr(2)3425 3403 y Ft(is)41 b(giv)m(en)g(b)m(y)-118 3519 y(m)m(ultiplication)c(b)m(y)43 b Fs(\020)8 b Ft(.)70 b(The)43 b(line)e(bundle)h Fs(L)g Ft(de\014nes)i(a)d(bilinear)f(alternating)g(form)g Fs(E)48 b Ft(on)42 b(\003,)i(its)d(\014rst)-118 3636 y(Chern)34 b(class,)e(whic)m(h)h(is)f(giv)m(en)h(b)m(y)h(a)e(sk)m(ew)i(Hermitian)d (2)22 b Fo(\002)g Ft(2)33 b(matrix)e Fs(T)46 b Ft(with)32 b(co)s(e\016cien)m(t)h(in)f Fs(K)j Ft(:=)27 b Fz(Q)p Ft(\()p Fs(\020)8 b Ft(\))-118 3752 y(\(cf.)33 b([)80 3752 y SDict begin H.S end 80 3752 a Ft(BL)210 3684 y SDict begin H.R end 210 3684 a 210 3752 a SDict begin [/Color [0 1 0]/H /I/Border [0 0 1]BorderArrayPatch/BS <>/Subtype /Link/Dest (cite.BL) cvn H.B /ANN pdfmark end 210 3752 a Ft(],)f(Ch.)i(9\):)361 3911 y Fs(E)50 b Ft(:)44 b(\003)39 b Fo(\002)g Ft(\003)44 b Fo(\000)-16 b(!)44 b Fz(Z)p Fs(;)212 b(E)6 b Ft(\()p Fs(x;)17 b(y)t Ft(\))43 b(=)i Fs(tr)1949 3927 y Fq(K)q(=)p Fj(Q)2110 3911 y Ft(\()2148 3870 y Fq(t)2177 3911 y Fs(xT)p 2303 3856 52 4 v 14 w(y)s Ft(\))p Fs(;)212 b Ft(\()p Fs(x;)17 b(y)31 b Fo(2)d Ft(\003)3037 3884 y Fo(\030)3037 3915 y Ft(=)3142 3911 y Fz(Z)p Ft([)p Fs(\020)8 b Ft(])3315 3870 y Fr(2)3354 3911 y Ft(\))p Fs(:)-118 4070 y Ft(The)31 b(complex)e(structure)i Fs(J)39 b Ft(on)29 b 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