#9441: Atkin-Lehner operators for Cremona modular symbols
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Reporter: cremona | Owner: craigcitro
Type: defect | Status: new
Priority: minor | Milestone: sage-5.0
Component: modular forms | Keywords: modular symbols
Author: John Cremona | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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The code in sage/libs/cremona wraps some of Cremona's modular symbols
code, including Hecke operators. The wrapping function incorrectly
assumes that the function heckeop(p) only works for primes p not dividing
the level, when in fact it works fine for primes dividing the level, in
that case returning the matrix of the Atkin-Lehner involution.
The patch remedies this, with some tests.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9441>
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