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Zbl 0744.11001
Fröhlich, A.; Taylor, M.J.
Algebraic number theory. (English)
[B] Cambridge Studies in Advanced Mathematics. 27. Cambridge (UK): Cambridge University Press. xiv, 355 p. (1990). ISBN 0-521-36664-X/hbk

This is an excellent introduction to the subject written by distinguished scholars. It is more ambitious than an average textbook containing material such as: (1) a thorough treatment of module theory over Dedekind rings -- a topic obviously close to hearts of the authors; (2) properties of differents and discriminants; (3) a short introduction to elliptic curves meant to encourage the reader to learn more; (4) Brauer relations between Dedekind zeta-functions. There are 93 exercises. Throughout the text great stress is laid on worked concrete numerical examples. As prerequisites the authors assume familiarity with elementary topology, Galois theory, and basic module theory including tensor products. The chapter headings are: I Algebraic foundations, II Dedekind domains (valuations, completions and module theory), III Extensions (decomposition, ramification, discriminants and differents), IV Class- groups and units, V Fields of low degree (concrete applications of general results to fields of degree six or less), VI Cyclotomic fields (including Gauss sums and elliptic curves), VII Diophantine equations (Fermat's last theorem, quadratic forms, cubic equations), VIII L- functions (including the Dedekind zeta-function, class number formulae and Brauer relations).
[V.Ennola (Turku)]

MSC 2000:: *11-01 Textbooks (number theory)
11Rxx Algebraic number theory: global fields
11R27 Units and factorization
11R33 Integral representations related to algebraic numbers
11R29 Class numbers, class groups, discriminants
11D41 Higher degree diophantine equations
11R18 Cyclotomic extensions
11R42 Zeta functions and L-functions of global number fields
11D25 Cubic and quartic diophantine equations
11R11 Quadratic extensions
11R16 Cubic and quartic extensions
11R21 Other number fields

Keywords: module theory over Dedekind rings; differents; discriminants; introduction to elliptic curves; Brauer relations between Dedekind zeta- functions; Dedekind domains; ramification; class-groups; units; cyclotomic fields; Fermat's last theorem; class number formulae

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