The Absolute Galois Group of a Semi-Local Field

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This book is devoted to the structure of the absolute Galois groups of certain algebraic extensions of the field of rational numbers. Its main result, a theorem proved by the authors and Florian Pop in 2012, describes the absolute Galois group of distinguished semi-local algebraic (and other) extensions of the rational numbers as free products of the free profinite group on countably many generators and local Galois groups. This is an instance of a positive answer to the generalized inverse problem of Galois theory.
Adopting both an arithmetic and probabilistic approach, the book carefully sets out the preliminary material needed to prove the main theorem and its supporting results. In addition, it includes a description of Melnikov's construction of free products of profinite groups and, for the first time in book form, an account of a generalization of the theory of free products of profinite groups and their subgroups.
 The book will be of interest to researchers in field arithmetic, Galois theory and profinite groups.


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ReiheSpringer Monographs in Mathematics
ISBN 9783030891909
Ausgabe 1st ed. 2021
Erscheinungsdatum 20.11.2021
Umfang 137 Seiten
Genre Mathematik/Arithmetik, Algebra
Format Hardcover
Verlag Springer International Publishing
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