Why certain Tannaka groups attached to abelian varieties are almost connected

preprint2015arXivOpen access

Abstract

We show that for a complex abelian variety X a certain Tannaka group G(X) attached to X is a pro-reductive group whose group of connected components is abelian, and hence isomorphic to the etale pro-finite abelian fundamental group of the dual abelian variety of X.

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