#18589: isogeny efficiency improvement
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Reporter: | Owner:
cremona | Status: positive_review
Type: | Milestone: sage-6.8
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers: Jeroen Demeyer
elliptic curves | Work issues:
Keywords: | Commit:
isogeny | 3d687e5225f67808eb6c5af5fbf4cb93f2000c62
Authors: John | Stopgaps:
Cremona |
Report Upstream: N/A |
Branch: |
u/cremona/18589 |
Dependencies: |
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Comment (by cremona):
Many thanks for a fantastic job reviewing this ( excelletn in both
mathematical and coding aspects). I will continue the discussion over at
#18611.
I suspect that there have been other changes since 6.7 which have sped up
my l=89 example, to do with factoring the 89-division polynomial over a
quadratic field. As you say, one computation of mult() could not take
such a long time even before this patch, yet a single run of
E.isogenies_prime_degree(89) is stil running after 14 hours, and all that
has to do is run isogenies_prime_degree_general once with l=89.
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Ticket URL: <http://trac.sagemath.org/ticket/18589#comment:50>
Sage <http://www.sagemath.org>
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