Arithmetic Groups
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		    789 James E. Humphreys
 
 Arithmetic Groups
 
 Springer-Verlag Berlin Heidelberg New York 1980
 
 Author James E. Humphreys Department of Mathematics & Statistics G R C Tower University of Massachusetts Amherst, M A 01003 USA
 
 A M S Subject Classifications (1980): 10 D07, 20 G 25, 20 G 30, 2 0 G 35, 20H05, 22E40 ISBN 3-540-09972-7 Springer-Verlag Berlin Heidelberg NewYork ISBN 0-387-09972-7 Springer-Verlag NewYork Heidelberg Berlin Library of Congress Cataloging in Publication Data. Humphreys, James E. Arithmetic groups. (Lecture notes in mathematics ; 789) Bibliography: p. Includes index. 1. Linear algebraic groups. 2. Lie groups. I. Title. 1LSeries: Lecture notes in mathematics (Berlin) ; 789. QA3.L28. no. 789. [QA171].510s [5t2'.2] 80-12922 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publisher. © by Springer-Verlag Berlin Heidelberg 1980 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210
 
 PREFACE An arithmetic
 
 group is (approximately)
 
 Lie group defined by arithmetic GL(n,Z)
 
 in GL(n,~),
 
 SL(n,Z)
 
 variety of contextss equivalence
 
 in SL(n,~).
 
 modular
 
 of quadratic
 
 functions,
 
 forms,
 
 these notes I have attempted of the underlying those
 
 themes,
 
 just mentioned.
 
 algebraic
 
 groups
 
 properties
 
 a discrete
 
 analysis,
 
 locally symmetric
 
 illustrated
 
 spaces,
 
 integral
 
 etc.
 
 by specific
 
 groups such as
 
 While no special knowledge
 
 of Lie groups
 
 these particular
 
 here is new.
 
 But by adopting
 
 approach I hope to make the literature
 
 and Matsumoto
 
 [1~)appear
 
 somewhat less formidable.
 
 Chapters i - III formulate
 
 (notably Borel
 
 and discrete
 
 [1], cf. Weil [2~ and Goldstein
 
 taken over local and global fields
 
 Here the
 
 e.g.,
 
 arithmetic
 
 mation. course
 
 determined
 
 interpretations.
 
 These introductory
 
 in number theory,
 
 Chapters
 
 Here one encounters "Siegel sets")
 
 "reduction theory"
 
 approximations
 
 finite presentability system)
 
 are not intended
 
 so the proofs
 
 for GL(n,Z)
 
 of GL(n,Z)
 
 linear and special linear
 
 in the spirit of Borel [5].
 
 and deduces,
 
 or SL(n,E).
 
 domains
 
 The BN-pair
 
 are used heavily here.
 
 to adelic and p-adic groups.
 
 the approach
 
 [I~ to the Congruence
 
 Chapter VI recounts
 
 (in the special
 
 (called
 
 for example,
 
 also a brief introduction
 
 of Matsumoto
 
 to be a first
 
 of a few well known theorems
 
 to fundamental
 
 in GL(n,~)
 
 and Iwasawa decomposition
 
 Finally,
 
 In
 
 domains have nice
 
 Another basic theme is strong approxi-
 
 chapters
 
 IV and V deal with general
 
 emphasizing
 
 domain corresponds
 
 by an integral basis of K over Q.
 
 of adeles or ideles such fundamental
 
 are just sketched. groups,
 
 O K of a number field K inside
 
 of K		
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