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Hi,

There are instances in which Sage thinks that a one-dimensional space of
modular symbols is not simple, and it decomposes the space into a
one-dimensional and a zero-dimensional subspace:


sage: C=ModularSymbols(1,14,0,GF(5)).cuspidal_submodule()
sage: C
Modular Symbols subspace of dimension 1 of Modular Symbols space of
dimension 2 for Gamma_0(1) of weight 14 with sign 0 over Finite Field of
size 5
sage: C.is_simple()
False
sage: C.simple_factors()

[Modular Symbols subspace of dimension 1 of Modular Symbols space of
dimension 2 for Gamma_0(1) of weight 14 with sign 0 over Finite Field of
size 5,
 Modular Symbols subspace of dimension 0 of Modular Symbols space of
dimension 2 for Gamma_0(1) of weight 14 with sign 0 over Finite Field of
size 5]


I've made this trac ticket #1583.

Alex

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