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arXiv 2107.04280math.NT
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数域上具有限制分支的伽罗瓦群的同构

Isomorphisms of Galois groups of number fields with restricted ramification

Ryoji Shimizu

摘要:

设$K$是数域,$S$是$K$的素数集合。我们把$K$在$S$外未分歧的最大扩张记为$K_S/K$,把它的伽罗瓦群记为$G_{K,S}$.在本文中,我们在一些假设下回答了如下问题:“对于$i=1,2$,设$K_i$是数域,$S_i$是$K_i$的(足够大的)素数集,$σ:G_{K_1,S_1}\to G_{K_2,S_2}$是同构. $σ$是由$K_{1,S_1}/K_1$和$K_{2,S_2}/K_2$之间的独特同构诱导的吗?“这里的主要假设是关于$S_i$的狄利克雷密度。

英文摘要:

Let $K$ be a number field and $S$ a set of primes of $K$. We write $K_S/K$ for the maximal extension of $K$ unramified outside $S$ and $G_{K,S}$ for its Galois group. In this paper, we answer the following question under some assumptions: "For $i=1,2$, let $K_i$ be a number field, $S_i$ a (sufficiently large) set of primes of $K_i$ and $σ:G_{K_1,S_1}\to G_{K_2,S_2}$ an isomorphism. Is $σ$ induced by a unique isomorphism between $K_{1,S_1}/K_1$ and $K_{2,S_2}/K_2$?" Here the main assumption is about the Dirichlet density of $S_i$.

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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