Number Fields

Frans Keune

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Paperback

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English

Radboud University Press
27 March 2023

Algebra; Number theory

Number Fields is a textbook for algebraic number theory. It grew out of lecture notes of master courses taught by the author at Radboud University, the Netherlands, over a period of more than four decades. It is self-contained in the sense that it uses only mathematics of a bachelor level, including some Galois theory. Part I of the book contains topics in basic algebraic number theory as they may be presented in a beginning master course on algebraic number theory. It includes the classification of abelian number fields by groups of Dirichlet characters. Class field theory is treated in Part II: the more advanced theory of abelian extensions of number fields in general. Full proofs of its main theorems are given using a 'classical' approach to class field theory, which is in a sense a natural continuation of the basic theory as presented in Part I. The classification is formulated in terms of generalized Dirichlet characters. This 'ideal-theoretic' version of class field theory dates from the first half of the twentieth century. In this book, it is described in modern mathematical language. Another approach, the 'idèlic version', uses topological algebra and group cohomology and originated halfway the last century. The last two chapters provide the connection to this more advanced idèlic version of class field theory. The book focuses on the abstract theory and contains many examples and exercises. For quadratic number fields algorithms are given for their class groups and, in the real case, for the fundamental unit. New concepts are introduced at the moment it makes a real difference to have them available.

By: Frans Keune
Imprint: Radboud University Press
Dimensions: Height: 254mm, Width: 178mm, Spine: 30mm
Weight: 1.007kg
ISBN: 9789493296039
ISBN 10: 9493296032
Pages: 588
Publication Date: 27 March 2023
Audience: General/trade , ELT Advanced
Format: Paperback
Publisher's Status: Active

Frans Keune (1945) studied mathematics at the University of Amsterdam, completed his PhD at Utrecht University and after a postdoc year at Cambridge University he has been affiliated with Radboud University in Nijmegen since 1973. He wrote papers on algebraic K-theory, both the general theory and the K-theory of number fields. In Nijmegen, he taught mainly algebra courses, in particular number theory, K-theory, Galois theory, and also introductory courses.

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Number Fields

Frans Keune

$67.95 $57.72

Paperback

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