#13615: Extend elliptic curve isogenies to arbitrary prime degrees
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Reporter: cremona | Owner: John Cremona
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: elliptic curves | Resolution:
Keywords: isogenies, sd51 | Merged in:
Authors: Kimi Tsukazaki, | Reviewers: John Cremona, Jenny
John Cremona | Cooley, Samuele Anni, Luca De Feo
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by cremona):
Thanks a lot for making your changes in to a mercurial patch. Looking at
it reminded me that I had always intended to remove the global (to the
module) isog_table anyway, replacing it with a function as we did for the
hyperelliptic_isogeny_data which plays a rather similar role. IN addition
this meanse that instaed of having these mysterious numbers in there, I
can put in a function which by default returns stored values, but can also
compute them on the fly, which then (1) allowed doctesting and (2) makes
it clearer where they come from (currently this is partially done in an
extended comment). The result will be something like the (cached)
function Psi(l, use_stored=True) which was converted to this form when
someone noticed that this file contributed a non-negligible amount to
Sage's startup time. I will do that tomorrow.
--
Ticket URL: <http://trac.sagemath.org/ticket/13615#comment:14>
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