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arXiv 2303.04396math.NT
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函数域的Kummer-忠实性

Kummer-faithfulness for function fields

Takuya Asayama

AI总结:

本文研究Kummer-忠实域的函数域类比,引入Drinfeld-Kummer-忠实(DKF)域概念,通过分歧理论给出其充分条件,并构造了相关实例。

摘要:

若一个完全域$K$满足:在$K$的每个有限扩张上,每个半阿贝尔簇的Mordell-Weil群都不存在非零可除元,则称该域是Kummer-忠实的。Kummer-忠实域的类别包含子$p$-进域,且被认为适合用于发展阿贝尔几何。本文研究了Kummer-忠实域概念的函数域类比。我们利用Drinfeld模引入了Drinfeld-Kummer-忠实(DKF)域的概念,并通过分歧理论给出了函数域的Galois扩张为DKF域的一个充分条件。更确切地说,在含$q$个元素的有限域$\boldsymbol{\rm F}_q$上的有理函数域$\boldsymbol{\rm F}_q(t)$的有限扩张之上,若一个Galois扩张在无穷素除子$(1/t)$之外的最大分歧折跃为有限的,则该扩张是DKF域。本文还给出了若干DKF域的例子,这些例子的构造受到了Ozeki和Taguchi提出的高度Kummer-忠实域例子的启发。

英文摘要:

A perfect field $K$ is said to be Kummer-faithful if the Mordell-Weil group of every semi-abelian variety over every finite extension of $K$ has no nonzero divisible element. The class of Kummer-faithful fields contains that of sub-$p$-adic fields and is thought to be suitable for developing anabelian geometry. In this paper, we investigate a function field analogue of the notion of Kummer-faithful fields. We introduce a notion of Drinfeld-Kummer-faithful (DKF) fields using Drinfeld modules. A sufficient condition for a Galois extension of a function field to be DKF is provided in terms of ramification theory. More precisely, a Galois extension with finite maximal ramification break outside the infinite prime $(1 / t)$ over a finite extension of the rational function field $\mathbb{F}_q(t)$ over the finite field $\mathbb{F}_q$ of $q$ elements is DKF. Some examples of DKF fields are also given. The construction of these examples is inspired by Ozeki and Taguchi's examples of highly Kummer-faithful fields.

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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