Extensions panachées autoduales

Details Extensions panachées autoduales Extensions panachées autoduales

2010-11-21

arxiv.org/abs/1011.4685v1

Mathematics

Algebraic Geometry

17 pages

Scientific paper

We study self-duality of Grothendieck's blended extensions (extensions
panach\'ees) 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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