#13633: Bug in cuspidal/eisenstein decomposition of modular symbols mod p
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Reporter: robharron | Owner: davidloeffler
Type: defect | Status: new
Priority: major | Milestone: sage-5.5
Component: modular forms | Keywords: modular symbols, mod p,
eisenstein
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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The following code
{{{
sage: ModularSymbols(Gamma0(46 * 47), 2, 1, GF(47)).eisenstein_subspace()
}}}
produces an ArithmeticError saying "subspace is not invariant under
matrix". In a presumably completely related example, the code
{{{
sage: ModularSymbols(Gamma0(46 * 47), 2, 1,
GF(47)).cuspidal_subspace().hecke_polynomial(47)
}}}
produces the exact same arithmetic error. I have computed examples like
above where 46 is replaced by any N in the range 24 to 45 or 47 to 54 and
where 47 is replaced with any prime less than 50 (not dividing N) and have
not encountered the problem.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13633>
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