#13053: wrong sign in square-free decomposition of polynomials over ZZ
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Reporter: saraedum | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-5.1
Component: factorization | Keywords: sd40.5 FLINT NTL ZZ
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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The NTL wrapper for {{{SquareFreeDecomp}}} gets the sign wrong for some
FLINT polynomials:
{{{
sage: R.<x> = PolynomialRing(ZZ, implementation='FLINT')
sage: f=-x^2
sage: f.squarefree_decomposition()
(-x)^2
}}}
It works correctly for NTL:
{{{
sage: R.<x> = PolynomialRing(ZZ, implementation='NTL')
sage: f=-x^2
sage: f.squarefree_decomposition()
(-1) * x^2
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13053>
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