Seminar on Algebraic Groups and Related Finite Groups Held at The In

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131 A. Borel R. Carter C.W Curtis N.lwahori T. A. Springer R. Steinberg

Seminar on Algebraic Groups and Related Finite Groups Held at The Institute for Advanced Study Princeton/NJ, 1968/69

Springer-Verlag Berlin Heidelberg New York Tokyo

Lecture Notes in Mathematics Edited by A. Oold and B. Eckmann Subseries: Mathematisches Institut der Universitat Bonn Adviser: F. Hirzebruch

131 A. Borel R. Carter C.W Curtis N.lwahori T. A. Springer R. Steinberg

Seminar on Algebraic Groups and Related Finite Groups Held at The Institute for Advanced Study Princeton/NJ, 1968/69

Springer-Verlag Berlin Heidelberg New York Tokyo

Authors Armand Borel Forschungsinstitut fur Mathematik, ETH Zentrum 8092 Zurich, Switzerland RW. Carter Mathematics Institute, University of Warwick Coventry CV4 7AL, England Charles W. Curtis University of Oregon, Dept. of Mathematics Eugene, OR 97403, USA Nagayoshi Iwahori Dept. of Mathematics, Faculty of Science University of Tokyo Hongo, Tokyo 113, Japan T. A. Springer Dept. of Mathematics, Rijksuniversiteit Utrecht Budapestlaan 6, Postbus 80.010 3508 TA Utrecht, The Netherlands Robert Steinberg Dept. of Mathematics, University of California Los Angeles, CA 90024, USA

1st Edition 1970 2nd Corrected Printing 1986

Mathematics Subject Classification (1980): 20-xx; 14L ISBN 3-540-04920-7 Springer-Verlag Berlin Heidelberg New York Tokyo ISBN 0-387-04920-7 Springer-Verlag New York Heidelberg Berlin Tokyo

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 ·Verwertungsgesellschafl Wort", Munich. «=> by Springer-Verlag Berlin Heidelberg 1970 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2146/3140-543210

INTRODUCTION

This volume contains the Notes of a seminar held at the Institute in 1968 -69, in the framework of a program on linear algebraic groups and finite groups. (':,) They emphasize a borderline topic between these two topics: the linear representations, both modular and over the complex numbers, of the finite Chevalley groups and of some generalizations of them.

They also contain a discussion of some questions on

algebraic groups which are both relevant to the main theme and of independent interest. Part A first supplies some background material:

construction

and main properties of Chevalley groups over a field or over

and

of rational representations of a semi-simple algebraic group over an algebraically closed groundfield.

It then turns to results of Curtis

and Steinberg describing the representations of a Chevalley group over a field of non-zero characteristic whose differential is also irreducible, and the construction of the irreducible representations of the group by means of them.

As far as the finite Chevalley