Topics in Cohomology of Groups

The book is a mostly translated reprint of a report on cohomology of groups from the 1950s and 1960s, originally written as background for the Artin-Tate notes on class field theory, following the cohomological approach. This report was first published (i

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1625

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Serge Lang

Topics in Cohomology of Groups

Springer

Author Serge Lang Mathematics Derpartment Yale University, Box 208 283 10 Hillhouse Avenue New Haven, CT 06520-8283, USA

Library of Congress Cataloging-in-Publication Data

Lang. Serge. 1927[Rapport sur la cohomologle des groupes. Engllsh] Topics in cohomology of groups / Serge Lang. p. cm. -- (Lecture notes in mathematics 1625) Includes bt b l iographical references t p , ) and tnc ax . ISBN 3-540-61181-9 (alk. paper) 1. Class field theory. 2. Group theory. 3. Homology theory. I. Title. II. Serles: Lecture notes ln mathematics (Springer -Verlag) ; 1625. QA247.L3513 1996 512' .74--dc20 96-26607

The first part of this book was originally published in French with the title "Rapport sur la cohomologie des groupes" by Benjamin Inc., New York, 1996. It was translated into English by the author for this edition. The last part (pp. 188-215) is new to this edition.

Mathematics Subject Classification (1991): IIS25, llS31, 20106, 12G05, 12010 ISBN 3-540-61181-9 Springer-Verlag Berlin Heidelberg New York This work is subject to copyright. All rights are reserved, whether the whole or part ofthe material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer-Verlag. Violations are liable for prosecution under the German Copyright Law. © Springer-Verlag Berlin Heidelberg 1996 Printed in Germany Typesetting: Camera-ready TEX output by the author SPIN: 10479722 46/3142-543210 - Printed on acid-free paper

Contents Chapter I. Existence and Uniqueness

§1. The abstract uniqueness theorem Notations, and the uniqueness theorem in Mod( G) Existence of the cohomological functor on Mod( G) Explicit computations Cyclic groups

§2. §3. §4. §5.

3 9 20 29 32

Chapter II. Relations with Subgroups

§1. §2. §3. §4.

Various morphisms Sylow subgroups Induced representations Double cosets

37 50 52 58

Chapter III. Cohomological Triviality

§1. The twins theorem §2. The triplets theorem §3. Splitting module and Tate's theorem

62 68 70

Chapter IV. Cup Products

§1. §2. §3. §4. §5. §6. §7. §8.

Erasability and uniqueness Existence Relations with subgroups The triplets theorem The cohomology ring and duality Periodicity The theorem of Tate-Nakayama Explicit Nakayama maps

73 83 87 88 89 95 98 101

VI

Chapter V. Augmented Products §1. Definitions §2. Existence §3. Some properties

109 112 113

Chapter VI. Spectral Sequences §1. Definitions §2. The Hochschild-Serre spectral sequence §3. Spectral sequences and cup products Chapter VII. §1. §2. §3. §4. §5. §6.

116 118 121

Groups of Galois Type (U npublished article