Might be fixed in Singular-3.1.6, changelog mentions "several bug fixes in factorization code". Haven't tried though. See http://trac.sagemath.org/14333
On Monday, April 8, 2013 10:18:32 AM UTC+1, Georgi Guninski wrote: > > Wrong factorization in QQ['x,y'] > > 5.8 on ubuntu and on sagenb.org. > > sage: Kxy.<x,y>=QQ[] > sage: P=-10*x^4*y + 40*x^3*y^2 - 80*x^2*y^3 + 80*x*y^4 - 30*y^5 + 20/9*y^3 > + 10/81*y > sage: fa=factor(P);fa > (-10/81) * y * (-3*x + 3*y + 1) * (-27*x^3 + 81*x^2*y - 135*x*y^2 + 81*y^3 > - 9*x^2 + 18*x*y - 27*y^2 - 3*x + 3*y - 1) > sage: factor(fa[-1][0]) > (-3*x + 3*y - 1) * (9*x^2 - 18*x*y + 27*y^2 + 1) > sage: fa[-1][0] > -27*x^3 + 81*x^2*y - 135*x*y^2 + 81*y^3 - 9*x^2 + 18*x*y - 27*y^2 - 3*x + > 3*y - 1 > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
