#6925: Fast way of calculating cuspidal subgroup of J0(N)
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Reporter: syazdani | Owner: tbd
Type: enhancement | Status: new
Priority: major | Milestone:
Component: algebra | Keywords: cuspidal subgroup, modular abelian
variety
Reviewer: | Author:
Merged: |
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This is the first implementation of Ligozat's method of calculating the
rational cuspidal subgroup of J_0(N). This is done by doing linear algebra
in d(N)*d(N) matrices, which seems considerably faster than the modular
symbol methods.
This code is functional at this point. The problems with it are
a) __cmp__ is not called.
b) Hecke operators aren't defined yet.
c) can't coerce specific degree zero cuspidal divisors in our group.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6925>
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