#8248: Small improvement in checking for elliptic curve isogenies
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Reporter: cremona | Owner: cremona
Type: enhancement | Status: new
Priority: minor | Milestone: sage-4.3.3
Component: elliptic curves | Keywords: isogenies
Author: John Cremona | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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When an isogeny is constructed from a kernel polynomial, by default
(unless check=False) it is checked whether the given kernel polynomial
divides the appropriate division polynomial. This is expensive when the
degree is large (e.g. 163!).
We provide a small patch which does this checking more efficiently.
The example in the patch which now takes 20s, used to take many minutes.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8248>
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