#14658: multivariate factorization errors
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Reporter: burcin | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: factorization | Resolution:
Keywords: singular factory | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by chapoton):
on 5.12.beta2, one gets:
{{{
sage: R.<x1,x2,x3> = QQ['x1,x2,x3']
sage: f = (x1+x2+x3)*(2*x1-x2+x3+2)*(4*x1+x2+x3+2)*(8*x1-x2+x3+4)
sage: f.factor()
(x1 + x2 + x3) * (64*x1^3 - 24*x1^2*x2 - 6*x1*x2^2 + x2^3 + 56*x1^2*x3 -
8*x1*x2*x3 - x2^2*x3 + 14*x1*x3^2 - x2*x3^2 + x3^3 + 128*x1^2 - 20*x1*x2 -
4*x2^2 + 68*x1*x3 - 4*x2*x3 + 8*x3^2 + 80*x1 - 4*x2 + 20*x3 + 16)
sage: factor(f)
---------------------------------------------------------------------------
Traceback (most recent call last):
...
RuntimeError: Floating point exception
}}}
so it either fails or returns a partial factorisation..
--
Ticket URL: <http://trac.sagemath.org/ticket/14658#comment:2>
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