#6887: Implement elliptic curve isogenies (continued)
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Reporter: cremona | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone:
Component: elliptic curves | Keywords: elliptic curve isogeny
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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Comment(by cremona):
I have almost finished revising the patch. I have fixed all the points
raised above except (so far) changing the name l_isogenies, which I agree
should have a name starting isog*. My new patch still has the strange
problem in its header, but I do not know how to fix that so if it does not
prevent it being applied I may give up on that part.
In addition, I changed the code for l=5,7,13 and j=0,1728 to avoid the
weird "feature" where a few random characteristics had to be excluded. I
remove my isogeny_machine function, opting instead for 6 separate
functions for these 6 cases, despite some repetition of code, since it
just got too complicated to write one function which handled all 6 cases
plus subcases (for endomorphisms and non-endos).
Hope to finish and re-post patch on Wednesday.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6887#comment:10>
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