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arXiv 1201.5973math.AGmath.AC
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有限映射上Frobenius分裂的显式推广

Explicitly Extending Frobenius Splittings over Finite Maps

Karl Schwede, Kevin Tucker

摘要:

设$π\: Y \to X$是特征$p > 0$的完满域上的正规簇的有限映射.作者以前的工作给出了$X$(或更一般的任何$p^{-e}$ -线性映射)上的Frobenius分裂何时扩展到$Y$的判据。在本文中,我们给出了一个替代的和高度明确的证明这个标准(检查项的条款)时,$π$是tamely分歧余维1。还探讨了一些其他的例子。

英文摘要:

Suppose that $π\: Y \to X$ is a finite map of normal varieties over a perfect field of characteristic $p > 0$. Previous work of the authors gave a criterion for when Frobenius splittings on $X$ (or more generally any $p^{-e}$-linear map) extend to $Y$. In this paper we give an alternate and highly explicit proof of this criterion (checking term by term) when $π$ is tamely ramified in codimension 1. Some additional examples are also explored.

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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