Algebraic Geometry and Complex Analysis Proceedings of the Workshop

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1414 E. Ramfrez de Arellano (Ed.)

Algebraic Geometry and Complex Analysis Proceedings of the Workshop held in Patzcuaro, Michoacan, Mexico, Aug. 10-14, 1987

Springer-Verlag Berlin Heidelberg NewYork London Paris Tokyo Hong Kong

Editor

Enrique Ramirez de Arellano Department of Mathematics Centro de Investigaci6n y de Estudios Avanzados dell.P.N. P.O. Box 14-740, Mexico, D.F. CP 07000, Mexico

Mathematics Subject Classification (1980): 14-06,32-06 ISBN 3-540-52175-5 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-52175-5 Springer-Verlag New York Berlin Heidelberg

This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in other ways, and storage in data banks. Duplication of this publication or parts thereof is only permitted under the provisions of the German Copyright Law of September 9, 1965, in its version of June 24, 1985, and a copyright fee must always be paid. Violations fall under the prosecution act of the German Copyright Law.

© Springer-Verlag Berlin Heidelberg 1989 Printed in Germany Printing and binding: Druckhaus Beltz, Hemsbach/Bergstr. 2146/3140-543210 - Printed on acid-free paper

PREFACE The

on Algebraic Geometry, and Complex Analysis was held

in the City of Patzcuaro, r'1ichoacan, This

from August 10 to 14,

1987.

was part of the activities of the "V Coloquio de Matematicas"

held by the

Department of the CINVESTAV-IPN, Mexico City.

Interinstitutional

Seminar on Algebraic Geometry (SIGA)

The

took part in the

organization. The Editorial Committee of the Proceedings was composed of Leticia Brambila

Paz

(UAM-IZT),

Enrique

Ramirez

de

Arellano

(CINVESTAV-IPN)

and

Sevin Reci11as P. The

contributions

of the Workshop. been refereed. the

to this volume were provided by participants

All artie 1es eontai ned here are in fi na 1 form and have A separate volume, with summaries of the lectures held at

mainly in Spanish,

is being published by the

De-

partment of the CINVESTAV-IPN. The organizers and the Editorial Committee wish to thank the participants in the Workshop, the contributors to this volume, and the referees. We also express our acknowledgements to the following Institutions for

their support of the Coloquio and

the I-Jorkshop:

Consejo Naeional de

Ciencia y Tecnologia, Secretar'ia de Educac i Sn PGbl ica, Universidad Naeional Autonoma de Mexico, Universidad Autonoma Metropolitana, Instituto Politeenieo Nacional, Centro de Investigacion y de Estudios Avanzados del IPN.

ENRIQUE RAMIREZ DE ARELLANO

CINVESTAV-IPN, MEXICO CITY, MARCH 1989

CONTENTS Short Course of Lectures The addition theorem for abstract Theta functions G.R. KEMPF Research Papers Existence of certain universal extensions L. BRAMBILA On a property of the Kummer variety and a relation between two moduli spaces of curves A. DEL CENTINA and S. RECILLAS

15

28

The bi-weighted Euler sequence on scrolls C.