version 1.4, 2000/12/08 08:26:09 |
version 1.25, 2003/04/28 03:02:52 |
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* DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE, |
* DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE, |
* PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE. |
* PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE. |
* |
* |
* $OpenXM: OpenXM_contrib2/asir2000/lib/bfct,v 1.3 2000/08/22 05:04:20 noro Exp $ |
* $OpenXM: OpenXM_contrib2/asir2000/lib/bfct,v 1.24 2003/04/28 02:15:30 noro Exp $ |
*/ |
*/ |
/* requires 'primdec' */ |
/* requires 'primdec' */ |
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/* annihilating ideal of F^s ? */ |
#define TMP_S ssssssss |
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#define TMP_DS dssssssss |
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#define TMP_T dtttttttt |
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#define TMP_DT tttttttt |
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#define TMP_Y1 yyyyyyyy1 |
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#define TMP_DY1 dyyyyyyyy1 |
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#define TMP_Y2 yyyyyyyy2 |
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#define TMP_DY2 dyyyyyyyy2 |
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extern LIBRARY_GR_LOADED$ |
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extern LIBRARY_PRIMDEC_LOADED$ |
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if(!LIBRARY_GR_LOADED) load("gr"); else ; LIBRARY_GR_LOADED = 1$ |
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if(!LIBRARY_PRIMDEC_LOADED) load("primdec"); else ; LIBRARY_PRIMDEC_LOADED = 1$ |
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/* toplevel */ |
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def bfunction(F) |
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{ |
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V = vars(F); |
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N = length(V); |
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D = newvect(N); |
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for ( I = 0; I < N; I++ ) |
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D[I] = [deg(F,V[I]),V[I]]; |
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qsort(D,compare_first); |
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for ( V = [], I = 0; I < N; I++ ) |
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V = cons(D[I][1],V); |
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return bfct_via_gbfct_weight(F,V); |
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} |
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/* annihilating ideal of F^s */ |
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def ann(F) |
def ann(F) |
{ |
{ |
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if ( member(s,vars(F)) ) |
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error("ann : the variable 's' is reserved."); |
V = vars(F); |
V = vars(F); |
W = append([y1,y2,t],V); |
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N = length(V); |
N = length(V); |
B = [1-y1*y2,t-y1*F]; |
D = newvect(N); |
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for ( I = 0; I < N; I++ ) |
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D[I] = [deg(F,V[I]),V[I]]; |
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qsort(D,compare_first); |
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for ( V = [], I = N-1; I >= 0; I-- ) |
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V = cons(D[I][1],V); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
for ( I = N-1, DV = []; I >= 0; I-- ) |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
DW = append([dy1,dy2,dt],DV); |
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W = append([TMP_Y1,TMP_Y2,TMP_T],V); |
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DW = append([TMP_DY1,TMP_DY2,TMP_DT],DV); |
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B = [1-TMP_Y1*TMP_Y2,TMP_T-TMP_Y1*F]; |
for ( I = 0; I < N; I++ ) { |
for ( I = 0; I < N; I++ ) { |
B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
B = cons(DV[I]+TMP_Y1*diff(F,V[I])*TMP_DT,B); |
} |
} |
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/* homogenized (heuristics) */ |
dp_nelim(2); |
dp_nelim(2); |
G0 = dp_weyl_gr_main(B,append(W,DW),0,0,6); |
G0 = dp_weyl_gr_main(B,append(W,DW),1,0,6); |
G1 = []; |
G1 = []; |
for ( T = G0; T != []; T = cdr(T) ) { |
for ( T = G0; T != []; T = cdr(T) ) { |
E = car(T); VL = vars(E); |
E = car(T); VL = vars(E); |
if ( !member(y1,VL) && !member(y2,VL) ) |
if ( !member(TMP_Y1,VL) && !member(TMP_Y2,VL) ) |
G1 = cons(E,G1); |
G1 = cons(E,G1); |
} |
} |
G2 = map(subst,G1,dt,1); |
G2 = map(psi,G1,TMP_T,TMP_DT); |
G3 = map(b_subst,G2,t); |
G3 = map(subst,G2,TMP_T,-1-s); |
G4 = map(subst,G3,t,-1-s); |
return G3; |
return G4; |
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} |
} |
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/* |
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* compute J_f|s=r, where r = the minimal integral root of global b_f(s) |
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* ann0(F) returns [MinRoot,Ideal] |
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*/ |
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def ann0(F) |
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{ |
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F = subst(F,s,TMP_S); |
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Ann = ann(F); |
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Bf = bfunction(F); |
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FList = cdr(fctr(Bf)); |
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for ( T = FList, Min = 0; T != []; T = cdr(T) ) { |
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LF = car(car(T)); |
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Root = -coef(LF,0)/coef(LF,1); |
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if ( dn(Root) == 1 && Root < Min ) |
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Min = Root; |
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} |
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return [Min,map(subst,Ann,s,Min,TMP_S,s,TMP_DS,ds)]; |
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} |
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def psi(F,T,DT) |
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{ |
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D = dp_ptod(F,[T,DT]); |
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Wmax = weight(D); |
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D1 = dp_rest(D); |
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for ( ; D1; D1 = dp_rest(D1) ) |
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if ( weight(D1) > Wmax ) |
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Wmax = weight(D1); |
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for ( D1 = D, Dmax = 0; D1; D1 = dp_rest(D1) ) |
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if ( weight(D1) == Wmax ) |
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Dmax += dp_hm(D1); |
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if ( Wmax >= 0 ) |
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Dmax = dp_weyl_mul(<<Wmax,0>>,Dmax); |
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else |
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Dmax = dp_weyl_mul(<<0,-Wmax>>,Dmax); |
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Rmax = dp_dtop(Dmax,[T,DT]); |
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R = b_subst(subst(Rmax,DT,1),T); |
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return R; |
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} |
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def weight(D) |
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{ |
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V = dp_etov(D); |
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return V[1]-V[0]; |
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} |
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def compare_first(A,B) |
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{ |
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A0 = car(A); |
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B0 = car(B); |
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if ( A0 > B0 ) |
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return 1; |
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else if ( A0 < B0 ) |
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return -1; |
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else |
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return 0; |
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} |
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/* generic b-function w.r.t. weight vector W */ |
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def generic_bfct(F,V,DV,W) |
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{ |
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N = length(V); |
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N2 = N*2; |
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/* If W is a list, convert it to a vector */ |
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if ( type(W) == 4 ) |
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W = newvect(length(W),W); |
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dp_weyl_set_weight(W); |
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/* create a term order M in D<x,d> (DRL) */ |
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M = newmat(N2,N2); |
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for ( J = 0; J < N2; J++ ) |
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M[0][J] = 1; |
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for ( I = 1; I < N2; I++ ) |
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M[I][N2-I] = -1; |
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VDV = append(V,DV); |
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/* create a non-term order MW in D<x,d> */ |
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MW = newmat(N2+1,N2); |
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for ( J = 0; J < N; J++ ) |
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MW[0][J] = -W[J]; |
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for ( ; J < N2; J++ ) |
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MW[0][J] = W[J-N]; |
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for ( I = 1; I <= N2; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MW[I][J] = M[I-1][J]; |
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/* create a homogenized term order MWH in D<x,d,h> */ |
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MWH = newmat(N2+2,N2+1); |
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for ( J = 0; J <= N2; J++ ) |
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MWH[0][J] = 1; |
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for ( I = 1; I <= N2+1; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MWH[I][J] = MW[I-1][J]; |
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/* homogenize F */ |
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VDVH = append(VDV,[h]); |
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FH = map(dp_dtop,map(dp_homo,map(dp_ptod,F,VDV)),VDVH); |
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/* compute a groebner basis of FH w.r.t. MWH */ |
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dp_gr_flags(["Top",1,"NoRA",1]); |
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GH = dp_weyl_gr_main(FH,VDVH,0,1,11); |
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dp_gr_flags(["Top",0,"NoRA",0]); |
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/* dehomigenize GH */ |
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G = map(subst,GH,h,1); |
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/* G is a groebner basis w.r.t. a non term order MW */ |
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/* take the initial part w.r.t. (-W,W) */ |
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GIN = map(initial_part,G,VDV,MW,W); |
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/* GIN is a groebner basis w.r.t. a term order M */ |
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/* As -W+W=0, gr_(-W,W)(D<x,d>) = D<x,d> */ |
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/* find b(W1*x1*d1+...+WN*xN*dN) in Id(GIN) */ |
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for ( I = 0, T = 0; I < N; I++ ) |
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T += W[I]*V[I]*DV[I]; |
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B = weyl_minipoly(GIN,VDV,0,T); /* M represents DRL order */ |
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return B; |
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} |
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/* all term reduction + interreduce */ |
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def generic_bfct_1(F,V,DV,W) |
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{ |
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N = length(V); |
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N2 = N*2; |
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/* If W is a list, convert it to a vector */ |
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if ( type(W) == 4 ) |
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W = newvect(length(W),W); |
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dp_weyl_set_weight(W); |
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/* create a term order M in D<x,d> (DRL) */ |
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M = newmat(N2,N2); |
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for ( J = 0; J < N2; J++ ) |
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M[0][J] = 1; |
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for ( I = 1; I < N2; I++ ) |
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M[I][N2-I] = -1; |
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VDV = append(V,DV); |
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/* create a non-term order MW in D<x,d> */ |
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MW = newmat(N2+1,N2); |
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for ( J = 0; J < N; J++ ) |
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MW[0][J] = -W[J]; |
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for ( ; J < N2; J++ ) |
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MW[0][J] = W[J-N]; |
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for ( I = 1; I <= N2; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MW[I][J] = M[I-1][J]; |
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/* create a homogenized term order MWH in D<x,d,h> */ |
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MWH = newmat(N2+2,N2+1); |
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for ( J = 0; J <= N2; J++ ) |
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MWH[0][J] = 1; |
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for ( I = 1; I <= N2+1; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MWH[I][J] = MW[I-1][J]; |
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/* homogenize F */ |
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VDVH = append(VDV,[h]); |
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FH = map(dp_dtop,map(dp_homo,map(dp_ptod,F,VDV)),VDVH); |
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/* compute a groebner basis of FH w.r.t. MWH */ |
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/* dp_gr_flags(["Top",1,"NoRA",1]); */ |
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GH = dp_weyl_gr_main(FH,VDVH,0,1,11); |
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/* dp_gr_flags(["Top",0,"NoRA",0]); */ |
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/* dehomigenize GH */ |
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G = map(subst,GH,h,1); |
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/* G is a groebner basis w.r.t. a non term order MW */ |
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/* take the initial part w.r.t. (-W,W) */ |
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GIN = map(initial_part,G,VDV,MW,W); |
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/* GIN is a groebner basis w.r.t. a term order M */ |
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/* As -W+W=0, gr_(-W,W)(D<x,d>) = D<x,d> */ |
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/* find b(W1*x1*d1+...+WN*xN*dN) in Id(GIN) */ |
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for ( I = 0, T = 0; I < N; I++ ) |
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T += W[I]*V[I]*DV[I]; |
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B = weyl_minipoly(GIN,VDV,0,T); /* M represents DRL order */ |
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return B; |
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} |
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def initial_part(F,V,MW,W) |
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{ |
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N2 = length(V); |
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N = N2/2; |
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dp_ord(MW); |
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DF = dp_ptod(F,V); |
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R = dp_hm(DF); |
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DF = dp_rest(DF); |
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E = dp_etov(R); |
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for ( I = 0, TW = 0; I < N; I++ ) |
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TW += W[I]*(-E[I]+E[N+I]); |
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RW = TW; |
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for ( ; DF; DF = dp_rest(DF) ) { |
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E = dp_etov(DF); |
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for ( I = 0, TW = 0; I < N; I++ ) |
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TW += W[I]*(-E[I]+E[N+I]); |
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if ( TW == RW ) |
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R += dp_hm(DF); |
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else if ( TW < RW ) |
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break; |
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else |
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error("initial_part : cannot happen"); |
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} |
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return dp_dtop(R,V); |
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} |
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/* b-function of F ? */ |
/* b-function of F ? */ |
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def bfct(F) |
def bfct(F) |
{ |
{ |
G4 = ann(F); |
/* XXX */ |
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F = replace_vars_f(F); |
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V = vars(F); |
V = vars(F); |
N = length(V); |
N = length(V); |
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D = newvect(N); |
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for ( I = 0; I < N; I++ ) |
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D[I] = [deg(F,V[I]),V[I]]; |
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qsort(D,compare_first); |
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for ( V = [], I = 0; I < N; I++ ) |
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V = cons(D[I][1],V); |
for ( I = N-1, DV = []; I >= 0; I-- ) |
for ( I = N-1, DV = []; I >= 0; I-- ) |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
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V1 = cons(s,V); DV1 = cons(ds,DV); |
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N1 = 2*(N+1); |
G0 = indicial1(F,reverse(V)); |
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G1 = dp_weyl_gr_main(G0,append(V1,DV1),0,1,0); |
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Minipoly = weyl_minipoly(G1,append(V1,DV1),0,s); |
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return Minipoly; |
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} |
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M = newmat(N1+1,N1); |
/* called from bfct() only */ |
for ( J = N+1; J < N1; J++ ) |
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M[0][J] = 1; |
def indicial1(F,V) |
for ( J = 0; J < N+1; J++ ) |
{ |
M[1][J] = 1; |
W = append([y1,t],V); |
#if 0 |
N = length(V); |
for ( I = 0; I < N+1; I++ ) |
B = [t-y1*F]; |
M[I+2][N-I] = -1; |
for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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DW = append([dy1,dt],DV); |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
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} |
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dp_nelim(1); |
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/* homogenized (heuristics) */ |
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G0 = dp_weyl_gr_main(B,append(W,DW),1,0,6); |
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G1 = map(subst,G0,y1,1); |
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G2 = map(psi,G1,t,dt); |
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G3 = map(subst,G2,t,-s-1); |
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return G3; |
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} |
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/* b-function computation via generic_bfct() (experimental) */ |
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def bfct_via_gbfct(F) |
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{ |
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V = vars(F); |
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N = length(V); |
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D = newvect(N); |
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for ( I = 0; I < N; I++ ) |
for ( I = 0; I < N; I++ ) |
M[I+2+N+1][N1-1-I] = -1; |
D[I] = [deg(F,V[I]),V[I]]; |
#elif 1 |
qsort(D,compare_first); |
for ( I = 0; I < N1-1; I++ ) |
for ( V = [], I = 0; I < N; I++ ) |
M[I+2][N1-I-1] = 1; |
V = cons(D[I][1],V); |
#else |
V = reverse(V); |
for ( I = 0; I < N1-1; I++ ) |
for ( I = N-1, DV = []; I >= 0; I-- ) |
M[I+2][I] = 1; |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
#endif |
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V1 = cons(s,V); DV1 = cons(ds,DV); |
B = [TMP_T-F]; |
G5 = dp_weyl_gr_main(cons(F,G4),append(V1,DV1),0,0,M); |
for ( I = 0; I < N; I++ ) { |
for ( T = G5, G6 = []; T != []; T = cdr(T) ) { |
B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
E = car(T); |
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if ( intersection(vars(E),DV1) == [] ) |
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G6 = cons(E,G6); |
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} |
} |
G6_0 = remove_zero(map(z_subst,G6,V)); |
V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
F0 = flatmf(cdr(fctr(dp_gr_main(G6_0,[s],0,0,0)[0]))); |
W = newvect(N+1); |
for ( T = F0, BF = []; T != []; T = cdr(T) ) { |
W[0] = 1; |
FI = car(T); |
R = generic_bfct(B,V1,DV1,W); |
for ( J = 1; ; J++ ) { |
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S = map(srem,map(z_subst,idealquo(G6,[FI^J],V1,0),V),FI); |
return subst(R,s,-s-1); |
for ( ; S != [] && !car(S); S = cdr(S) ); |
} |
if ( S != [] ) |
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/* use an order s.t. [t,x,y,z,...,dt,dx,dy,dz,...,h] */ |
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def bfct_via_gbfct_weight(F,V) |
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{ |
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N = length(V); |
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D = newvect(N); |
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Wt = getopt(weight); |
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if ( type(Wt) != 4 ) { |
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for ( I = 0, Wt = []; I < N; I++ ) |
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Wt = cons(1,Wt); |
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} |
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Tdeg = w_tdeg(F,V,Wt); |
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WtV = newvect(2*(N+1)+1); |
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WtV[0] = Tdeg; |
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WtV[N+1] = 1; |
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/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
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for ( I = 1; I <= N; I++ ) { |
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WtV[I] = Wt[I-1]; |
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WtV[N+1+I] = Tdeg-Wt[I-1]+1; |
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} |
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WtV[2*(N+1)] = 1; |
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dp_set_weight(WtV); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [TMP_T-F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
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} |
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V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
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W = newvect(N+1); |
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W[0] = 1; |
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R = generic_bfct_1(B,V1,DV1,W); |
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dp_set_weight(0); |
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return subst(R,s,-s-1); |
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} |
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/* use an order s.t. [x,y,z,...,t,dx,dy,dz,...,dt,h] */ |
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def bfct_via_gbfct_weight_1(F,V) |
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{ |
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N = length(V); |
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D = newvect(N); |
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Wt = getopt(weight); |
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if ( type(Wt) != 4 ) { |
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for ( I = 0, Wt = []; I < N; I++ ) |
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Wt = cons(1,Wt); |
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} |
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Tdeg = w_tdeg(F,V,Wt); |
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WtV = newvect(2*(N+1)+1); |
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/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
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for ( I = 0; I < N; I++ ) { |
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WtV[I] = Wt[I]; |
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WtV[N+1+I] = Tdeg-Wt[I]+1; |
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} |
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WtV[N] = Tdeg; |
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WtV[2*N+1] = 1; |
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WtV[2*(N+1)] = 1; |
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dp_set_weight(WtV); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [TMP_T-F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
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} |
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V1 = append(V,[TMP_T]); DV1 = append(DV,[TMP_DT]); |
|
W = newvect(N+1); |
|
W[N] = 1; |
|
R = generic_bfct_1(B,V1,DV1,W); |
|
dp_set_weight(0); |
|
return subst(R,s,-s-1); |
|
} |
|
|
|
def bfct_via_gbfct_weight_2(F,V) |
|
{ |
|
N = length(V); |
|
D = newvect(N); |
|
Wt = getopt(weight); |
|
if ( type(Wt) != 4 ) { |
|
for ( I = 0, Wt = []; I < N; I++ ) |
|
Wt = cons(1,Wt); |
|
} |
|
Tdeg = w_tdeg(F,V,Wt); |
|
|
|
/* a weight for the first GB computation */ |
|
/* [t,x1,...,xn,dt,dx1,...,dxn,h] */ |
|
WtV = newvect(2*(N+1)+1); |
|
WtV[0] = Tdeg; |
|
WtV[N+1] = 1; |
|
WtV[2*(N+1)] = 1; |
|
/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
|
for ( I = 1; I <= N; I++ ) { |
|
WtV[I] = Wt[I-1]; |
|
WtV[N+1+I] = Tdeg-Wt[I-1]+1; |
|
} |
|
dp_set_weight(WtV); |
|
|
|
/* a weight for the second GB computation */ |
|
/* [x1,...,xn,t,dx1,...,dxn,dt,h] */ |
|
WtV2 = newvect(2*(N+1)+1); |
|
WtV2[N] = Tdeg; |
|
WtV2[2*N+1] = 1; |
|
WtV2[2*(N+1)] = 1; |
|
for ( I = 0; I < N; I++ ) { |
|
WtV2[I] = Wt[I]; |
|
WtV2[N+1+I] = Tdeg-Wt[I]+1; |
|
} |
|
|
|
for ( I = N-1, DV = []; I >= 0; I-- ) |
|
DV = cons(strtov("d"+rtostr(V[I])),DV); |
|
|
|
B = [TMP_T-F]; |
|
for ( I = 0; I < N; I++ ) { |
|
B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
|
} |
|
V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
|
V2 = append(V,[TMP_T]); DV2 = append(DV,[TMP_DT]); |
|
W = newvect(N+1,[1]); |
|
dp_weyl_set_weight(W); |
|
|
|
VDV = append(V1,DV1); |
|
N1 = length(V1); |
|
N2 = N1*2; |
|
|
|
/* create a non-term order MW in D<x,d> */ |
|
MW = newmat(N2+1,N2); |
|
for ( J = 0; J < N1; J++ ) { |
|
MW[0][J] = -W[J]; MW[0][N1+J] = W[J]; |
|
} |
|
for ( J = 0; J < N2; J++ ) MW[1][J] = 1; |
|
for ( I = 2; I <= N2; I++ ) MW[I][N2-I+1] = -1; |
|
|
|
/* homogenize F */ |
|
VDVH = append(VDV,[h]); |
|
FH = map(dp_dtop,map(dp_homo,map(dp_ptod,B,VDV)),VDVH); |
|
|
|
/* compute a groebner basis of FH w.r.t. MWH */ |
|
GH = dp_weyl_gr_main(FH,VDVH,0,1,11); |
|
|
|
/* dehomigenize GH */ |
|
G = map(subst,GH,h,1); |
|
|
|
/* G is a groebner basis w.r.t. a non term order MW */ |
|
/* take the initial part w.r.t. (-W,W) */ |
|
GIN = map(initial_part,G,VDV,MW,W); |
|
|
|
/* GIN is a groebner basis w.r.t. a term order M */ |
|
/* As -W+W=0, gr_(-W,W)(D<x,d>) = D<x,d> */ |
|
|
|
/* find b(W1*x1*d1+...+WN*xN*dN) in Id(GIN) */ |
|
for ( I = 0, T = 0; I < N1; I++ ) |
|
T += W[I]*V1[I]*DV1[I]; |
|
|
|
/* change of ordering from VDV to VDV2 */ |
|
VDV2 = append(V2,DV2); |
|
dp_set_weight(WtV2); |
|
for ( Pind = 0; ; Pind++ ) { |
|
Prime = lprime(Pind); |
|
GIN2 = dp_weyl_gr_main(GIN,VDV2,0,-Prime,0); |
|
if ( GIN2 ) break; |
|
} |
|
|
|
R = weyl_minipoly(GIN2,VDV2,0,T); /* M represents DRL order */ |
|
dp_set_weight(0); |
|
return subst(R,s,-s-1); |
|
} |
|
|
|
/* minimal polynomial of s; modular computation */ |
|
|
|
def weyl_minipolym(G,V,O,M,V0) |
|
{ |
|
N = length(V); |
|
Len = length(G); |
|
dp_ord(O); |
|
setmod(M); |
|
PS = newvect(Len); |
|
PS0 = newvect(Len); |
|
|
|
for ( I = 0, T = G; T != []; T = cdr(T), I++ ) |
|
PS0[I] = dp_ptod(car(T),V); |
|
for ( I = 0, T = G; T != []; T = cdr(T), I++ ) |
|
PS[I] = dp_mod(dp_ptod(car(T),V),M,[]); |
|
|
|
for ( I = Len - 1, GI = []; I >= 0; I-- ) |
|
GI = cons(I,GI); |
|
|
|
U = dp_mod(dp_ptod(V0,V),M,[]); |
|
U = dp_weyl_nf_mod(GI,U,PS,1,M); |
|
|
|
T = dp_mod(<<0>>,M,[]); |
|
TT = dp_mod(dp_ptod(1,V),M,[]); |
|
G = H = [[TT,T]]; |
|
|
|
for ( I = 1; ; I++ ) { |
|
if ( dp_gr_print() ) |
|
print(".",2); |
|
T = dp_mod(<<I>>,M,[]); |
|
|
|
TT = dp_weyl_nf_mod(GI,dp_weyl_mul_mod(TT,U,M),PS,1,M); |
|
H = cons([TT,T],H); |
|
L = dp_lnf_mod([TT,T],G,M); |
|
if ( !L[0] ) { |
|
if ( dp_gr_print() ) |
|
print(""); |
|
return dp_dtop(L[1],[t]); /* XXX */ |
|
} else |
|
G = insert(G,L); |
|
} |
|
} |
|
|
|
/* minimal polynomial of s over Q */ |
|
|
|
def weyl_minipoly(G0,V0,O0,P) |
|
{ |
|
HM = hmlist(G0,V0,O0); |
|
|
|
N = length(V0); |
|
Len = length(G0); |
|
dp_ord(O0); |
|
PS = newvect(Len); |
|
for ( I = 0, T = G0, HL = []; T != []; T = cdr(T), I++ ) |
|
PS[I] = dp_ptod(car(T),V0); |
|
for ( I = Len - 1, GI = []; I >= 0; I-- ) |
|
GI = cons(I,GI); |
|
PSM = newvect(Len); |
|
DP = dp_ptod(P,V0); |
|
|
|
for ( Pind = 0; ; Pind++ ) { |
|
Prime = lprime(Pind); |
|
if ( !valid_modulus(HM,Prime) ) |
|
continue; |
|
setmod(Prime); |
|
for ( I = 0, T = G0, HL = []; T != []; T = cdr(T), I++ ) |
|
PSM[I] = dp_mod(dp_ptod(car(T),V0),Prime,[]); |
|
|
|
NFP = weyl_nf(GI,DP,1,PS); |
|
NFPM = dp_mod(NFP[0],Prime,[])/ptomp(NFP[1],Prime); |
|
|
|
NF = [[dp_ptod(1,V0),1]]; |
|
LCM = 1; |
|
|
|
TM = dp_mod(<<0>>,Prime,[]); |
|
TTM = dp_mod(dp_ptod(1,V0),Prime,[]); |
|
GM = NFM = [[TTM,TM]]; |
|
|
|
for ( D = 1; ; D++ ) { |
|
if ( dp_gr_print() ) |
|
print(".",2); |
|
NFPrev = car(NF); |
|
NFJ = weyl_nf(GI, |
|
dp_weyl_mul(NFP[0],NFPrev[0]),NFP[1]*NFPrev[1],PS); |
|
NFJ = remove_cont(NFJ); |
|
NF = cons(NFJ,NF); |
|
LCM = ilcm(LCM,NFJ[1]); |
|
|
|
/* modular computation */ |
|
TM = dp_mod(<<D>>,Prime,[]); |
|
TTM = dp_mod(NFJ[0],Prime,[])/ptomp(NFJ[1],Prime); |
|
NFM = cons([TTM,TM],NFM); |
|
LM = dp_lnf_mod([TTM,TM],GM,Prime); |
|
if ( !LM[0] ) |
break; |
break; |
|
else |
|
GM = insert(GM,LM); |
} |
} |
BF = cons([FI,J],BF); |
|
|
if ( dp_gr_print() ) |
|
print(""); |
|
U = NF[0][0]*idiv(LCM,NF[0][1]); |
|
Coef = []; |
|
for ( J = D-1; J >= 0; J-- ) { |
|
Coef = cons(strtov("u"+rtostr(J)),Coef); |
|
U += car(Coef)*NF[D-J][0]*idiv(LCM,NF[D-J][1]); |
|
} |
|
|
|
for ( UU = U, Eq = []; UU; UU = dp_rest(UU) ) |
|
Eq = cons(dp_hc(UU),Eq); |
|
M = etom([Eq,Coef]); |
|
B = henleq(M,Prime); |
|
if ( dp_gr_print() ) |
|
print(""); |
|
if ( B ) { |
|
R = 0; |
|
for ( I = 0; I < D; I++ ) |
|
R += B[0][I]*s^I; |
|
R += B[1]*s^D; |
|
return R; |
|
} |
} |
} |
return BF; |
|
} |
} |
|
|
|
def weyl_nf(B,G,M,PS) |
|
{ |
|
for ( D = 0; G; ) { |
|
for ( U = 0, L = B; L != []; L = cdr(L) ) { |
|
if ( dp_redble(G,R=PS[car(L)]) > 0 ) { |
|
GCD = igcd(dp_hc(G),dp_hc(R)); |
|
CG = idiv(dp_hc(R),GCD); CR = idiv(dp_hc(G),GCD); |
|
U = CG*G-dp_weyl_mul(CR*dp_subd(G,R),R); |
|
if ( !U ) |
|
return [D,M]; |
|
D *= CG; M *= CG; |
|
break; |
|
} |
|
} |
|
if ( U ) |
|
G = U; |
|
else { |
|
D += dp_hm(G); G = dp_rest(G); |
|
} |
|
} |
|
return [D,M]; |
|
} |
|
|
|
def weyl_nf_mod(B,G,PS,Mod) |
|
{ |
|
for ( D = 0; G; ) { |
|
for ( U = 0, L = B; L != []; L = cdr(L) ) { |
|
if ( dp_redble(G,R=PS[car(L)]) > 0 ) { |
|
CR = dp_hc(G)/dp_hc(R); |
|
U = G-dp_weyl_mul_mod(CR*dp_mod(dp_subd(G,R),Mod,[]),R,Mod); |
|
if ( !U ) |
|
return D; |
|
break; |
|
} |
|
} |
|
if ( U ) |
|
G = U; |
|
else { |
|
D += dp_hm(G); G = dp_rest(G); |
|
} |
|
} |
|
return D; |
|
} |
|
|
def remove_zero(L) |
def remove_zero(L) |
{ |
{ |
for ( R = []; L != []; L = cdr(L) ) |
for ( R = []; L != []; L = cdr(L) ) |
|
|
return S; |
return S; |
} |
} |
|
|
def member(A,L) { |
|
for ( ; L != []; L = cdr(L) ) |
|
if ( A == car(L) ) |
|
return 1; |
|
return 0; |
|
} |
|
|
|
def intersection(A,B) |
def intersection(A,B) |
{ |
{ |
for ( L = []; A != []; A = cdr(A) ) |
for ( L = []; A != []; A = cdr(A) ) |
Line 182 def v_factorial(V,N) |
|
Line 798 def v_factorial(V,N) |
|
{ |
{ |
for ( J = N-1, R = 1; J >= 0; J-- ) |
for ( J = N-1, R = 1; J >= 0; J-- ) |
R *= V-J; |
R *= V-J; |
|
return R; |
|
} |
|
|
|
def w_tdeg(F,V,W) |
|
{ |
|
dp_set_weight(newvect(length(W),W)); |
|
T = dp_ptod(F,V); |
|
for ( R = 0; T; T = cdr(T) ) { |
|
D = dp_td(T); |
|
if ( D > R ) R = D; |
|
} |
|
return R; |
|
} |
|
|
|
def replace_vars_f(F) |
|
{ |
|
return subst(F,s,TMP_S,t,TMP_T,y1,TMP_Y1,y2,TMP_Y2); |
|
} |
|
|
|
def replace_vars_v(V) |
|
{ |
|
V = replace_var(V,s,TMP_S); |
|
V = replace_var(V,t,TMP_T); |
|
V = replace_var(V,y1,TMP_Y1); |
|
V = replace_var(V,y2,TMP_Y2); |
|
return V; |
|
} |
|
|
|
def replace_var(V,X,Y) |
|
{ |
|
V = reverse(V); |
|
for ( R = []; V != []; V = cdr(V) ) { |
|
Z = car(V); |
|
if ( Z == X ) |
|
R = cons(Y,R); |
|
else |
|
R = cons(Z,R); |
|
} |
return R; |
return R; |
} |
} |
end$ |
end$ |