Opened 15 years ago

Closed 15 years ago

Last modified 15 years ago

#63 closed bug (duplicate)

reported by Stas: bug in factorize and elim

Reported by: seelisch Owned by: hannes
Priority: major Milestone: Release 3-1-0
Component: factory Version:
Keywords: factorize, elim Cc:


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]=1 _[2]=x2+xy+yz+z2



poly f=(x+z)*(x+y); factorize(f); this one is OK


_[1]=1 _[2]=x+z _[3]=x+y



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]=1 _[2]=x+z _[3]=x+y+z



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!


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 bulygin

Resolution: duplicate
Status: newclosed

comment:2 Changed 15 years ago by seelisch

Milestone: Release 3-1-0
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