version 1.2, 2000/03/10 07:12:06 |
version 1.6, 2000/04/20 02:30:35 |
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/* $OpenXM: OpenXM_contrib2/asir2000/lib/sp,v 1.1.1.1 1999/12/03 07:39:11 noro Exp $ */ |
/* $OpenXM$ */ |
/* |
/* |
sp : functions related to algebraic number fields |
sp : functions related to algebraic number fields |
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Revision History: |
Revision History: |
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99/08/24 noro modified for 1999 release version |
2000/03/10 noro fixed several bugs around gathering algebraic numbers |
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1999/08/24 noro modified for 1999 release version |
*/ |
*/ |
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#include "defs.h" |
#include "defs.h" |
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L = aflist(append(H,append([X-A,R],cdr(T))),AL); |
L = aflist(append(H,append([X-A,R],cdr(T))),AL); |
} |
} |
} |
} |
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} |
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/* |
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Input: |
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F=F(x,a1,...,an) |
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DL = [[an,dn(an,...,a1)],...,[a2,d2(a2,a1)],[a1,d1(a1)]] |
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'ai' denotes a root of di(t). |
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Output: |
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irreducible factorization of F over Q(a1,...,an) |
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[[F1(x,a1,...,an),e1],...,[Fk(x,a1,...,an),ek]] |
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'ej' denotes the multiplicity of Fj. |
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*/ |
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def af_noalg(F,DL) |
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{ |
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DL = reverse(DL); |
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N = length(DL); |
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Tab = newvect(N); |
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/* Tab = [[a1,r1],...]; ri is a root of di(t,r(i-1),...,r1). */ |
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AL = []; |
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for ( I = 0; I < N; I++ ) { |
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T = DL[I]; |
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for ( J = 0, DP = T[1]; J < I; J++ ) |
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DP = subst(DP,Tab[J][0],Tab[J][1]); |
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B = newalg(DP); |
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Tab[I] = [T[0],B]; |
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F = subst(F,T[0],B); |
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AL = cons(B,AL); |
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} |
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FL = af(F,AL); |
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for ( T = FL, R = []; T != []; T = cdr(T) ) |
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R = cons([conv_noalg(T[0][0],Tab),T[0][1]],R); |
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return reverse(R); |
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} |
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/* |
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Input: |
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F=F(x) univariate polynomial over the rationals |
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Output: |
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[FL,DL] |
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DL = [[an,dn(an,...,a1)],...,[a2,d2(a2,a1)],[a1,d1(a1)]] |
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'ai' denotes a root of di(t). |
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FL = [F1,F2,...] |
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irreducible factors of F over Q(a1,...,an) |
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*/ |
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def sp_noalg(F) |
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{ |
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L = sp(F); |
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FL = map(algptorat,L[0]); |
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for ( T = L[1], DL = []; T != []; T = cdr(T) ) |
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DL = cons([algtorat(T[0][0]),T[0][1]],DL); |
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return [FL,reverse(DL)]; |
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} |
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def conv_noalg(F,Tab) |
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{ |
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N = size(Tab)[0]; |
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F = algptorat(F); |
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for ( I = N-1; I >= 0; I-- ) |
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F = subst(F,algtorat(Tab[I][1]),Tab[I][0]); |
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return F; |
} |
} |
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def aflist(L,AL) |
def aflist(L,AL) |