version 1.1, 2005/08/02 07:16:42 |
version 1.5, 2005/08/09 05:34:10 |
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localf split_lexgb; |
localf split_lexgb; |
localf sort_lex_dec,sort_lex_inc; |
localf sort_lex_dec,sort_lex_inc; |
localf inverse_or_split, linear_dim; |
localf inverse_or_split, linear_dim; |
localf sp_sqrt,calcb,dp_monic_mod,monic_gb; |
localf dp_monic_mod,monic_gb; |
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localf membership_test; |
localf dp_chrem,intdptoratdp,intdpltoratdpl; |
localf dp_chrem,intdptoratdp,intdpltoratdpl; |
localf comp_by_ht,dp_gr_mod,gr_chrem; |
localf comp_by_ht,dp_gr_mod,gr_chrem; |
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localf construct_sqfrbasis; |
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/* |
/* |
* G : a 0-dim lex gb, reduced |
* G : a 0-dim lex gb, reduced |
Line 52 def inverse_or_split(V,Id,F) |
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Line 54 def inverse_or_split(V,Id,F) |
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Ret = inv_or_split_dalg(DF); |
Ret = inv_or_split_dalg(DF); |
if ( type(Ret) == 1 ) { |
if ( type(Ret) == 1 ) { |
/* Ret = 1/F */ |
/* Ret = 1/F */ |
return Ret; |
Dp = dalgtodp(Ret); |
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return dp_dtop(Dp[0],V)/Dp[1]; |
} else { |
} else { |
/* Ret = GB(Id:F) */ |
/* Ret = GB(Id:F) */ |
/* compute GB(Id+<f>) */ |
/* compute GB(Id+<f>) */ |
Gquo = append(map(ptozp,map(dp_dtop,Ret,V)),Id); |
Gquo = append(map(ptozp,map(dp_dtop,Ret,V)),Id); |
Gquo = nd_gr(Gquo,V,0,2); |
/* inter-reduction */ |
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Gquo = nd_gr_postproc(Gquo,V,0,2,0); |
DTotal = linear_dim(Id,V,2); |
DTotal = linear_dim(Id,V,2); |
Dquo = linear_dim(Gquo,V,2); |
Dquo = linear_dim(Gquo,V,2); |
Drem = DTotal-Dquo; |
Drem = DTotal-Dquo; |
Line 67 def inverse_or_split(V,Id,F) |
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Line 71 def inverse_or_split(V,Id,F) |
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} |
} |
} |
} |
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/* add F(X,V) to Id(B) */ |
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/* returns a list of splitted ideals */ |
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/* B should be a triangular basis */ |
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def construct_sqfrbasis(F,X,B,V) |
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{ |
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if ( type(F) == 1 ) |
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return []; |
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B = sort_lex_dec(B,V); |
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V1 = cons(X,V); |
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F = nd_nf(F,reverse(B),cons(X,V),2,0); |
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D = deg(F,X); |
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H = coef(F,D,X); |
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if ( type(H) == 2 ) { |
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Ret = inverse_or_split(V,B,H); |
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if ( type(Ret) == 4 ) { |
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/* H != 0 on Id_nz, H = 0 on Id_z */ |
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B0=construct_sqfrbasis(F,X,Ret[0],V); |
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B1=construct_sqfrbasis(F,X,Ret[1],V); |
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return append(B0,B1); |
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} else |
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F = nd_nf(F*Ret,reverse(B),cons(X,V),2,0); |
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} |
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B1 = cons(F,B); |
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/* F is monic */ |
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M = minipoly(B1,V1,2,X,zzz); |
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S = sqfr(M); S = cdr(S); |
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if ( length(S) == 1 && car(S)[1] == 1 ) |
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return [cons(F,B)]; |
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else { |
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R = []; |
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for ( T = S; T != []; T = cdr(T) ) { |
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G = nd_gr_trace(cons(subst(car(T)[0],zzz,X),B1),V1,1,1,2); |
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R1 = split_lexgb(G,V1); |
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R = append(R1,R); |
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} |
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return R; |
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} |
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} |
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def sort_lex_dec(B,V) |
def sort_lex_dec(B,V) |
{ |
{ |
dp_ord(2); |
dp_ord(2); |
Line 92 def linear_dim(G,V,Ord) |
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Line 136 def linear_dim(G,V,Ord) |
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return length(MB); |
return length(MB); |
} |
} |
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def membership_test(B,G,V,O) |
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{ |
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B = map(ptozp,B); |
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G = map(ptozp,G); |
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for ( T = B; T != []; T = cdr(T) ) |
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if ( nd_nf(car(T),G,V,O,0) ) return 0; |
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return 1; |
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} |
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def gr_chrem(B,V,O,Dim) |
def gr_chrem(B,V,O,Dim) |
{ |
{ |
B = map(ptozp,B); |
B = map(ptozp,B); |
Line 105 def gr_chrem(B,V,O,Dim) |
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Line 158 def gr_chrem(B,V,O,Dim) |
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Mod *= P; |
Mod *= P; |
if ( G != [] ) |
if ( G != [] ) |
HS = HSM; |
HS = HSM; |
R1 = intdpltoratdpl(G,Mod); |
M = idiv(isqrt(2*Mod),2); |
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R1 = intdpltoratdpl(G,Mod,M); |
if ( R1 ) { |
if ( R1 ) { |
if ( Found && R == R1 ) |
if ( Found && R == R1 |
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&& (GB=nd_gr_postproc(map(dp_dtop,R,V),V,0,O,1)) |
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&& membership_test(B,GB,V,O) ) |
break; |
break; |
else { |
else { |
R = R1; Found = 1; |
R = R1; Found = 1; |
} |
} |
} |
} |
} |
} |
return map(dp_dtop,R,V); |
return GB; |
} |
} |
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def comp_by_ht(A,B) |
def comp_by_ht(A,B) |
Line 128 def comp_by_ht(A,B) |
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Line 184 def comp_by_ht(A,B) |
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return 0; |
return 0; |
} |
} |
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def intdpltoratdpl(G,Mod) |
def intdpltoratdpl(G,Mod,M) |
{ |
{ |
R = []; |
for ( R = []; G != []; G = cdr(G) ) { |
M = calcb(Mod); |
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for ( ; G != []; G = cdr(G) ) { |
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T = intdptoratdp(car(G),Mod,M); |
T = intdptoratdp(car(G),Mod,M); |
if ( !T ) |
if ( !T ) |
return 0; |
return 0; |
Line 167 def dp_chrem(G,HS,Mod,GM,HSM,P) |
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Line 221 def dp_chrem(G,HS,Mod,GM,HSM,P) |
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return []; |
return []; |
R = []; |
R = []; |
M1 = inv(Mod,P); |
M1 = inv(Mod,P); |
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ModM1 = Mod*M1; |
for ( ; G != []; G = cdr(G), GM = cdr(GM) ) { |
for ( ; G != []; G = cdr(G), GM = cdr(GM) ) { |
E = car(G); EM = car(GM); |
E = car(G); EM = car(GM); |
E1 = E+(EM-E)*Mod*M1; |
E1 = E+(EM-E)*ModM1; |
R = cons(E1,R); |
R = cons(E1,R); |
} |
} |
return reverse(R); |
return reverse(R); |
Line 190 def dp_monic_mod(F,P) |
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Line 245 def dp_monic_mod(F,P) |
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return dp_rat(FP/dp_hc(FP)); |
return dp_rat(FP/dp_hc(FP)); |
} |
} |
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def calcb(M) { |
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N = 2*M; |
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T = sp_sqrt(N); |
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if ( T^2 <= N && N < (T+1)^2 ) |
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return idiv(T,2); |
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else |
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error("afo"); |
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} |
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def sp_sqrt(A) { |
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for ( J = 0, T = A; T >= 2^27; J++ ) { |
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T = idiv(T,2^27)+1; |
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} |
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for ( I = 0; T >= 2; I++ ) { |
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S = idiv(T,2); |
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if ( T = S+S ) |
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T = S; |
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else |
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T = S+1; |
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} |
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X = (2^27)^idiv(J,2)*2^idiv(I,2); |
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while ( 1 ) { |
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if ( (Y=X^2) < A ) |
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X += X; |
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else if ( Y == A ) |
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return X; |
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else |
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break; |
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} |
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while ( 1 ) |
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if ( (Y = X^2) <= A ) |
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return X; |
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else |
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X = idiv(A + Y,2*X); |
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} |
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endmodule; |
endmodule; |
end$ |
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end$ |
end$ |