#12949: Better congruence testing for odd arithmetic subgroups
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Reporter: davidloeffler | Owner: craigcitro
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: modular forms | Resolution:
Keywords: | Merged in:
Authors: David Loeffler | Reviewers: Vincent Delecroix
Report Upstream: N/A | Work issues:
Branch: | Dependencies:
Stopgaps: |
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Changes (by davidloeffler):
* status: needs_work => needs_review
* work_issues: test =>
Comment:
Here's a new patch. The link now points to a copy Kurth's homepage as
mirrored on an archive website. I kept the randomized test as it was, but
flagged it with "long"; the problem is that if you reduce the index too
far, then you only ever get one of a very small set of subgroups and so
it's not really a worthwhile test.
I also corrected a tiny parity issue in the test routine (there are no odd
subgroups of index 2 mod 4, and it was pure luck that the default
parameters for the test routine don't provoke this error).
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Ticket URL: <http://trac.sagemath.org/ticket/12949#comment:13>
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