arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1709.03094math.NT
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关于函数域扩张专门化的局部性态

On the local behaviour of specializations of function field extensions

Joachim König, François Legrand, Danny Neftin

摘要:

给定一个特征为零的域$k$和一个不确定的$k$上的$T$,我们研究了$k$的有限Galois扩展在$k$素数处的局部行为,这些有限Galois扩展是有限Galois扩展$E/k(T)$(具有$E/k$正则)在点$t_0 \in \mathbb{P}^1(k)$处的专门化。本文给出了$k$在特殊化中素数分解群的一般结果,推广了Beckmann关于惯性群的一个基本结果.然后,我们应用我们的结果来研究交叉产品,希尔伯特-Grunwald性质,和有限参数集。

英文摘要:

Given a field $k$ of characteristic zero and an indeterminate $T$ over $k$, we investigate the local behaviour at primes of $k$ of finite Galois extensions of $k$ arising as specializations of finite Galois extensions $E/k(T)$ (with $E/k$ regular) at points $t_0 \in \mathbb{P}^1(k)$. We provide a general result about decomposition groups at primes of $k$ in specializations, extending a fundamental result of Beckmann concerning inertia groups. We then apply our result to study crossed products, the Hilbert--Grunwald property, and finite parametric sets.

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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