PREFACE During the week of December 10-14, 1984, the Department of Mathematics of the Centro de Investigaci6n del lPN held an International Conference in Mexico City, to celebrate Solomon Lefschetz• 100th birthday. This conference was made possible by the generous financial assistance of the Centro de Investigaci6n del lPN, the Consejo Nacional de Ciencia y Tecnologia, the Secretaria de Educaci6n Publica (MEXICO) and the National Science Foundation (USA). We thought it appropriate to have lectures in: Algebraic Geometry, Algebraic Topology and Differential Equations, the three main areas of Lefschetz 1 research. The Proceedings appear in three volumes and commemorate Lefschetz 1 s contribution to the development of Mathematics in Mexico. This volume includes the papers on Algebraic Topology. I want to thank the participants and especially the authors of this volume for making the conference a success. Samuel Gitler. CINVESTAV, Mexico City, November 1986. ix
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