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The 24th Annual Charles R. DePrima Memorial
David Gabai Poincare's work on Topology Abstract: We start by surveying the state of topology prePoincare and then discuss some of Poincare's remarkable seminal and fundamental contributions to topology during the period 18921912. We indicate their huge impact on subsequent research as well as some open problems flowing from it.
David Gabai is the HughesRogers Professor of Mathematics at the Princeton University and is one of the world's most distinguished topologists. In particular, he made many fundamental contributions to 3dimensionaltopology and geometry. He is a recipient of many honors including the Clay Research Award and the Veblen Prize. David is a member of the National Academy of Sciences.
The Charles R. DePrima Memorial Undergraduate Mathematics Lecture was established by a gift from Charles R. DePrima and Margaret Thurmond DePrima. The Institute is privileged to honor the memory of Professor DePrima and his distinguished contribution to mathematics and Caltech, where he served as a faculty member for over forty years, with a lecture each year by an outstanding mathematician. Professor DePrima perceived that there were few or no special talks or seminars designed for undergraduates; he and Margaret DePrima intended that this lecture series would fill that need. 
