#63 closed bug (duplicate)
reported by Stas: bug in factorize and elim
Reported by: | seelisch | Owned by: | hannes |
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Priority: | major | Milestone: | Release 3-1-0 |
Component: | factory | Version: | |
Keywords: | factorize, elim | Cc: |
Description
Liebes Team,
Bei mir die folgende Probleme aufgetreten sind (3-1-0, Aug 2008).
1.) factorize
ring r=(2,a),(x,y,z),lp;minpoly=a2+a+1; poly f=(x+z)*(x+y+z); product of two linear functions factorize(f); false!
[1]:
[2]:
1,1
poly f=(x+z)*(x+y); factorize(f); this one is OK
[1]:
[2]:
1,1,1
this problem does not occur in char=0 ring r=0,(x,y,z),lp; poly f=(x+z)*(x+y+z); factorize(f);
[1]:
[2]:
1,1,1
2.) elim
Im Help steht es niergenwo, dass id in elim(id,v) soll ein GB (SB) sein. Bei mir aber habe ich gemerkt, dass bei id und std(id) man verschiedene Outputs kriegt.
ring r=(16,a),(V(2..1),U(15..1)),lp; ideal sys=a12*U(13)+a9*U(10)+a8*U(9)+a6*U(7)+a4*U(5)+a3*U(4)+a2*U(3)+a*U(2), U(13)+U(10)+U(9)+U(7)+U(5)+U(4)+U(3)+U(2), a3*U(13)+a6*U(10)+a7*U(9)+a9*U(7)+a11*U(5)+a12*U(4)+a13*U(3)+a14*U(2), a6*U(13)+a12*U(10)+a14*U(9)+a3*U(7)+a7*U(5)+a9*U(4)+a11*U(3)+a13*U(2), a9*U(13)+a3*U(10)+a6*U(9)+a12*U(7)+a3*U(5)+a6*U(4)+a9*U(3)+a12*U(2), a12*U(13)+a9*U(10)+a13*U(9)+a6*U(7)+a14*U(5)+a3*U(4)+a7*U(3)+a11*U(2), U(13)+U(10)+a5*U(9)+U(7)+a10*U(5)+U(4)+a5*U(3)+a10*U(2), a3*U(13)+a6*U(10)+a12*U(9)+a9*U(7)+a6*U(5)+a12*U(4)+a3*U(3)+a9*U(2), V(1)*U(1)+U(2), V(1)*U(2)+U(3), V(1)*U(3)+U(4), V(1)*U(4)+U(5), V(1)*U(5)+U(6), V(1)*U(6)+U(7), V(1)*U(7)+U(8), V(1)*U(8)+U(9), V(1)*U(9)+U(10), V(1)*U(10)+U(11), V(1)*U(11)+U(12), V(1)*U(12)+U(13), V(1)*U(13)+U(14), V(1)*U(14)+U(15), V(1)*U(15)+U(1); elim(sys,1..2); eliminate V(1) and V(2), is not correct!
_[1]=U(1)
elim(std(sys),1..2); now is OK
_[1]=U(1) _[2]=U(2) _[3]=U(3) _[4]=U(4) _[5]=U(5) _[6]=U(6) _[7]=U(7) _[8]=U(8) _[9]=U(9) _[10]=U(10) _[11]=U(11) _[12]=U(12) _[13]=U(13) _[14]=U(14) _[15]=U(15)
Grüße, Stas.
Change History (2)
comment:1 Changed 15 years ago by
Resolution: | → duplicate |
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Status: | new → closed |
comment:2 Changed 15 years ago by
Milestone: | → Release 3-1-0 |
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