Hodge Theory Proceedings of the U.S.-Spain Workshop held in Sant Cug

Over the past 2O years classical Hodge theory has undergone several generalizations of great interest in algebraic geometry. The papers in this volume reflect the recent developments in the areas of: mixed Hodge theory on the cohomology of singular and op

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1246

Hodge Theory Proceedings of the U.S.-Spain Workshop held in Sant Cugat (Barcelona), Spain June 24-30, 1985

Edited by E. Cattani, F. Guillen, A. Kaplan and F. Puerta

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

Lecture Notes in Mathematics Edited by A. Dold and B. Eckmann

1246

Hodge Theory Proceedings of the U.S.-Spain Workshop held in Sant Cugat (Barcelona), Spain June 24-30, 1985

Edited by E. Cattani, F. Guillen, A. Kaplan and F. Puerta

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo

Editors

Eduardo Cattani Aroldo Kaplan Dep.artmentof Mathematics, University of Massachusetts Amherst, Massachusetts 01003, USA Francisco Guillen Fernando Puerta Departament de Maternatiques ETSEIB Universitat Politecnica de Catalunya Avenida Diagonal 647, 08028 Barcelona, Spain

Mathematics Subject Classification (1980): Primary: 14C30, 32J25 Secondary: 14B05, 14B 15, 14005, 14F40, 14J 15, 32C38, 32G 13, 32G20 ISBN 3-540-17743-4 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-17743-4 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 dats 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 Copyriqht Law.

© Springer-Verlag Berlin Heidelberg 1987 Printed in Germany Printing and binding: Druckhaus Beltz, Hemsbach/Bergstr. 2146/3140-543210

Introduction This volume contains most of the papers presented at the 1985 U.S.-Spain workshop on Hodge Theory, which took place in June of that year in St.

Cugat del Valles

(Barcelona),

under the

auspices of the Joint Committee for Scientific and Technological Cooperation between the two countries. The methods of harmonic theory introduced by Riemann in the study of algebraic curves and extended by Hodge to higher dimensions, yield important consequences for the structure of smooth

projective

varieties;

prototypical

examples

are

the

decomposition of the complex cohomology groups of such varieties according to Hodge type, and the Lefschetz decomposition in terms of primitive cohomology classes.

Since Hodge,

these ideas have

undergone several generalizations of great interest in algebraic geometry.

This volume focuses on those concerning singular and

open varieties,

families,

and the rational homotopy of varieties,

which have been developed during the past 20 years. The

structure present

in the

local

system of

cohomology

defined by a family of smooth varieties was encoded by Griffiths in the notion of a Some

of

include: Hodge

the

variation of

related

questions

(polarized) explored

in

Hodge

s t ru ct.ur-e l

these

proceedings

.