#6072: [with patch, needs review] Boundary space for GammaH fails to identify
vanishing classes
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Reporter: davidloeffler | Owner: craigcitro
Type: defect | Status: new
Priority: minor | Milestone: sage-4.0.1
Component: modular forms | Keywords:
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Comment(by craigcitro):
Hi David,
Yep, I'm definitely responsible for this code. There '''is''' a bug here
-- in the case that the sign is 0, and the weight is odd, there are
definitely relations I didn't use to determine if a cusp that gets coerced
in is 0. (Note that the relation still gets picked up if you're computing
with sign equal to 1 or -1.) Luckily, though, the code that's used to
compute modular symbols spaces is `_coerce_in_manin_symbol` -- so it
wasn't really affecting the resulting modular symbols spaces that were
computed. (I had checked the dimensions of these spaces were correct via
the dimension formulas, so I would have been a little surprised if they
were wrong.)
I think the attached patch should fix this -- let me know if you don't
trust it, or if you think it needs more documentation/doctests.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6072#comment:1>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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