Extensions panachées autoduales

preprint2010arXivOpen access

Abstract

We study self-duality of Grothendieck's blended extensions (extensions panachées) in the context of a tannakian category. The set of equivalence classes of symmetric, resp. antisymmetric, blended extensions is naturally endowed with a torsor structure, which enables us to compute the unipotent radical of the associated monodromy groups in various situations

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