#5921: [with patch, needs review] factoring integer polynomials does not factor
the content
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Reporter: cremona | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.0
Component: algebra | Keywords:
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Comment(by AlexGhitza):
Hmmm. We just had this situation happen on a different ticket: the code
in this patch is fine but breaks something, which really exposes a pre-
existing bug.
In this case, John's code factors the content and the "normalised,
content-free" polynomial separately and multiplies the two factorisations.
The problem is the with the types: the first factorisation consists of
integers, while the second one consists of polynomials. Multiplying them
together yields a factorisation where some factors are of type integer and
the others of type polynomial, and then this breaks all sorts of things
later on.
I've made a new ticket at #5928 and will have a patch up there soon. Then
John's patch on this ticket will be good to go.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5921#comment:4>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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