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Let A be a modular abelian variety. The period mapping of A
is a map from the rational homology of A to a complex vector space.
The complex period mapping from the rational homology of the abelian variety
A to Cd, where
d=(dim)A, computed using prec terms of q-expansions.
Given an abelian variety A and an integer n return generators
for the complex period lattice of A, computed using n
terms of q-expansions. We use the map from A to a modular symbols
abelian variety to define the period mapping (so this map must be injective).
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