PREFACE The Solomon Lefschetz Centennial Conference was held in the Centro de Investigacion y de Estudios Avanzados in Mexico City from 10 to 14, December 1984. The topics of the conference were Algebraic Geometry, Algebraic Topology and Differential Equations, the three areas in which the late S. Lefschetz had made original contributions. Experts from many countries, as well as mathematicians from Mexico, participated actively and enthusiastically resulting in a very successful conference. This volume contains the proceedings of the conference corresponding to the general area of Differential Equations. Financial support to the conference came from CONACyT, SEP and CINVESTAV del IPN of Mexico, and the NSF of U.S.A. cosponsored and supported the conference through their Cooperative Science Programs with Latin America and the Caribbean. The Organizing Committee of the Conference and the Editorial Committee of the Proceedings would like to thank all the participants in the conference and all the contributors to this volume. A. Verjovsky. CINVESTAV, Mexico City, November 1986. ix
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