#19229: Bug in elliptic curve Galois Representation
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Reporter: cremona | Owner:
Type: defect | Status: needs_work
Priority: major | Milestone: sage-6.10
Component: elliptic curves | Resolution:
Keywords: Galois | Merged in:
representations | Reviewers:
Authors: John Cremona | Work issues:
Report Upstream: N/A | Commit:
Branch: u/cremona/19229 | 62accc077ff28e2306364abaa60199846e292fdd
Dependencies: | Stopgaps:
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Comment (by cremona):
The new commit addresses the caching issue and the testing of the CM
special cases. I also improved CM detection simply by caching the
relevant functions. Testing whether one algebraic integer j of degree h
is CM involves computing the quadratic orders of class number h: this is
now cached so only done once for each h; and then computing the Hilbert
class polynomials for each of these: now also cached, so as soon as a non-
CM j of degree h is tested then testing any others of the same degree is
no harder than checking whether its absolute minimal polynomial is in a
cached list.
Pushing the new commit once tests have completed.
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Ticket URL: <http://trac.sagemath.org/ticket/19229#comment:22>
Sage <http://www.sagemath.org>
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