Modular Functions of One Variable II Proceedings International Summe

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349 Modular Functions of One Variable II Proceedings International Summer School University of Antwerp, RUCA July 17-August 3, 1972

Edited by P. Deligne and W Kuijk

Springer-Verlag Berlin Heidelberg New York Tokyo

Editors Pierre Oeligne Institute for Advanced Study, School of Mathematics Princeton, NJ 08540, USA Willem Kuijk Rijksuniversitair Centrum Antwerpen, Leerstoel Algebra Groenenborgerlaan 171, 2020 Antwerpen, Belgium

1st Edition 1973 2nd Corrected Printing 1986 Mathematics Subject Classification (1970): 10-02, 10015, 10Hl0, 14Gl0, 14G99, 14H 10, 14L99 ISBN 3-540-06558-X Springer-Verlag Berlin Heidelberg New York Tokyo ISBN 0-387-06558-X 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 iUustrations, 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 "Verwertungsgesellschaft Wort", Munich.

© by Springer-Verlag Berlin Heidelberg 1973 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2146/3140,543210

PREFACE

This is Volume 2 of the Proceedings of the International Summer School on "Modular functions of one variable and arithmetical applications" which took place at RUCA, Antwerp University, from July 17 till August 3, 1972.

It contains papers by W. Casselman, P. Deligne, R. Langlands and 1.1. Piateckii-Shapiro.

Its theme is the

interplay between modular schemes for elliptic curves, and representations of GL(2).

P. Deligne

W. Kuyk

CONTENTS

W. CASSELMAN

An assortment of results on represen-

1

tations of GL (k) 2

P. DELIGNE

Formes mOdulaires et representations

55

de GL(2)

W. CASSELMAN

On representations of GL

and the arith-

107

Les schemas de modules de courbes ellip-

143

metic of modular curves

P. DELIGNE - M. RAPOPORT

2

tiques

1.1. PIATECKII-SHAPIRO

Zeta-functions of modular curves

317

R.P. LANGLANDS

Modular forms and t-adic representations

361

P. DELIGNE

Les constantes des equations fonctionnelles 501 des fonctions L

Addresses of authors

598

AN ASSORTMENT OF RESULTS ON REPRESENTATIONS OF GL (k) 2

by W. Casselman~

International Summer School on Modular Functions} Antwerp

~ The author's travel expences for this conference were paid for by a grant from the National Research Council of Canada.

1972

-2-

Cas-2

Contents

Introduction

3

Notations §1.

Generalities

5

Appendix

§2.

The principal series representations of

15

GL (O) and the associated Hecke algebras 2 §3.

The principal series of G

29

§4.

Absolutely cuspidal representations

43

References

53

-3-

Cas-3

Introduction

Let k be a p-adic field, 0 its integers.

My aim in these notes has been

to collect in one convenient place most of the results I need in [5] concerning the representations of GL (k). 2

My choice of which results

to include