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Tannaka duality and formal glueings

By Jack Hall

Also appears in collection : Jean Morlet Chair: Artin approximation and Infinite Dimensional Geometry / Chaire Jean Morlet : approximation de Artin et géométrie en dimension infinie

After recalling classical Tannaka duality for finite groups, I will discuss an extension to equivariant algebraic geometry, and more generally to algebraic stacks. Surprisingly, this is related to formal glueings and Neron-Popescu desingularization.

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