#11890: Sage cannot factor polynomials over number fields with unfactorable
discriminant
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Reporter: jdemeyer | Owner: davidloeffler
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.3
Component: number fields | Keywords: nffactor PARI nfinit pari_nf
Work_issues: | Upstream: N/A
Reviewer: | Author: Jeroen Demeyer
Merged: | Dependencies: #11891, #11130
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Comment(by lftabera):
Jeroen,
This ticket is a duplicate of #10910
In that ticket I presented another approach. I still use nffactor but do
not use nfinit UNLESS nfinit has already been computed and cached. A
couple of comments regarding both approaches:
- Now we do not need nfinit for nffactor. So we can use either nffactor
or factornf at will.
- In most cases nffactor will be faster than factornf (I should give
numbers to sustain that though).
- My patch also work for non-integral generators.
- But my patch fails in your example with a PariError exception:
precision too low.
I have to investigate this error. It might be a Pari bug or there are
instances where we really need factornf.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11890#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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