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arXiv 1409.7530math.ACmath.NT
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关于Witt向量Frobenius

On the Witt vector Frobenius

Christopher Davis, Kiran S. Kedlaya

摘要:

本文研究交换环的$p$ -典型Witt向量上的Frobenius映射的核与上核,而不一定是特征$p$ .给出了有限长和无限长Witt向量上Frobenus映射满射性的一些等价条件,证明了前一个条件在某些整扩张下是稳定的,这一事实与Faltings几乎纯性定理的推广密切相关.

英文摘要:

We study the kernel and cokernel of the Frobenius map on the $p$-typical Witt vectors of a commutative ring, not necessarily of characteristic $p$. We give some equivalent conditions to surjectivity of the Frobenus map on both finite and infinite length Witt vectors; the former condition turns out to be stable under certain integral extensions, a fact which relates closely to a generalization of Faltings's almost purity theorem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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