Extensions panach\'ees autoduales
classification
🧮 math.AG
keywords
extensionsblendedpanachantisymmetricassociatedautodualescategoryclasses
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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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