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arXiv · 2105.06243

Cartier Duals of Two-Dimensional Kummer--Artin--Schreier--Witt Type Kernels

Michio Amano
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Abstract

We study Cartier duality for the kernel of a two-dimensional Kummer--Artin--Schreier--Witt type homomorphism over a $\mathbb{Z}_{(p)}$-algebra. For the $l$-th such homomorphism between extensions of deformations of the additive group, we give, under a natural nilpotency condition, an explicit description of the Cartier dual of its kernel in terms of Witt vectors. More precisely, the Cartier dual is identified with the kernel of a homomorphism between quotient fppf sheaves of two-dimensional Witt vectors determined by the operators naturally associated with the Kummer--Artin--Schreier--Witt type homomorphism. The proof combines the Sekiguchi--Suwa descriptions of characters and Hochschild extensions in terms of deformed Artin--Hasse exponentials with an analysis of the formal completion and its behavior with respect to the fppf topology.

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Michio Amano. 2021-05-13. Cartier Duals of Two-Dimensional Kummer--Artin--Schreier--Witt Type Kernels. https://arxiv.org/abs/2105.06243

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