#17283: Dimension mismatch in cuspidal_submodule()
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Reporter: pbruin | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: modular forms | Keywords: modular symbols dimension
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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In the following example, two ways of computing the dimension of a space
of modular symbols do not give the same result:
{{{
sage: k.<i> = QuadraticField(-1)
sage: G = DirichletGroup(192)
sage: chi = G([i,-1,-1])
sage: M = ModularSymbols(chi);
sage: M.cuspidal_submodule()
AssertionError: According to dimension formulas the cuspidal subspace of
"Modular Symbols space of dimension 0 and level 192, weight 2, character
[zeta4, 1, -1], sign 0, over Cyclotomic Field of order 4 and degree 2" has
dimension 40; however, computing it using modular symbols we obtained 0,
so there is a bug (please report!).
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/17283>
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