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June 2012 The absolute Galois group of subfields of the field of totally $\boldsymbol{S}$-adic numbers
Dan Haran, Moshe Jarden, Florian Pop
Funct. Approx. Comment. Math. 46(2): 205-223 (June 2012). DOI: 10.7169/facm/2012.46.2.6

Abstract

For a finite set $S$ of local primes of a countable Hilbertian field $K$ and for $\sigma_1,\ldots,\sigma_e\in\Gal(K)$ we denote the field of totally $S$-adic numbers by $\K_{tot,S}$, the fixed field of $\sigma_1,\ldots,\sigma_e$ in $\K_{tot,S}$ by $\K_{tot,S}({\mathbf \sigma})$, and the maximal Galois extension of $K$ in $\KtotS({\mathbf \sigma})$ by $\KtotS[{\mathbf \sigma}]$. We prove that for almost all ${\mathbf \sigma}\in\Gal(K)^e$ the absolute Galois group of $\K_{tot,S}[{\mathbf \sigma}]$ is isomorphic to the free product of $\hat{F}_\omega$ and a free product of local factors over $S$.

Citation

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Dan Haran. Moshe Jarden. Florian Pop. "The absolute Galois group of subfields of the field of totally $\boldsymbol{S}$-adic numbers." Funct. Approx. Comment. Math. 46 (2) 205 - 223, June 2012. https://doi.org/10.7169/facm/2012.46.2.6

Information

Published: June 2012
First available in Project Euclid: 25 June 2012

zbMATH: 1318.12001
MathSciNet: MR2931667
Digital Object Identifier: 10.7169/facm/2012.46.2.6

Subjects:
Primary: 12E30

Keywords: absolute Galois group , free product , Haar measure , Hilbertian field , local primes , totally $S$-adic numbers

Rights: Copyright © 2012 Adam Mickiewicz University

Vol.46 • No. 2 • June 2012
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