#6925: Fast way of calculating cuspidal subgroup of J0(N)
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Reporter: syazdani | Owner: tbd
Type: enhancement | Status:
Priority: major | needs_review
Component: modular forms | Milestone: sage-5.13
Keywords: cuspidal subgroup, modular | Resolution:
abelian variety | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by syazdani):
Chapoton's fix was correct. The initial doctest was incorrect.
Also, that is the correct Ligozat reference. I added the reference to my
paper as well, which is what the algorithm is based upon.
I changed the name of rational_direct_cuspidal_subgroup to
rational_cuspidal_subgroup_ligozat, as it was suggested, and replaced cmp
function with eq and ne functions instead.
Finally, sorry for being MIA on this ticket for so long. I think I had an
incorrect filter archiving these emails automatically.
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Ticket URL: <http://trac.sagemath.org/ticket/6925#comment:15>
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