#9390: is_galois_relative() not always right
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Reporter: arminstraub | Owner: davidloeffler
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: number fields | Keywords: galois extension
Author: Francis Clarke | Upstream: N/A
Reviewer: Marco Streng | Merged:
Work_issues: |
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Comment(by mstreng):
Replying to [comment:7 fwclarke]:
> I can't reproduce this. Actually `is_galois` is not particularly
ubiquitous (and certainly does figure in `gal_reps.py`):
How could you be so sure about that? The timeout is caused by the long
test
{{{EllipticCurve([1,-1,0,-107,-379]).galois_representation().image_type(7)}}}
The image_type() part runs forever on 4.6.1.alpha2 with your second patch,
and is quite fast without any patches. That method is a long piece of
code, so I didn't read it all, but it does suggest that it uses is_galois
somewhere via another function.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9390#comment:8>
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