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Full Description
In my long professional life as a mathematician I have had to deliver various survey lectures. They were of different character according to the occasion. A selected number are reproduced in this volume. They were, with few exceptions, printed in books or in periodicals, and are reproduced here without any modification. I started as a student at the ETH Zurich in 1935 and have spent my working Ufe there, with the exception of the period 1942-1948 (lecturer then associate professor at the University of Lausanne) and 1947 and 1951/52 (Institute for Advanced Study Princeton). In 1948 I was appointed as a professor at the ETH; I retired in 1984 and have since then been professor emeritus. The surveys in this volume are lectures given at congresses and workshops, at international congresses of mathematicians (plenary or section lectures), and at special occasions like birthdays or commemorations. They all reflect the special interests of the respective times. Although they are in fields of topology, algebra and differential geometry they reveal the big changes mathematics has undergone over the years from 1943 to 2004. New thinking has been developed; it has created new problems, or simply has let old problems appear in a new light.
Contents
L'idée de dimension.- Topologie und Algebra.- Complex-analytic manifolds.- Homotopie et dualité.- Groupes d'homotopie et dualité.- Homotopy and cohomology theory.- Simple homotopy type and categories of fractions.- Some recent developments in the homology theory of groups.- Poincaré duality groups of dimension two are surface groups.- Continuous solutions of linear equations — An old problem, its history, and its solution.- Mathematics: Questions and Answers.- Hurwitz-Radon matrices revisited: From effective solution of the Hurwitz matrix equations to Bott periodicity.- Birth of fibre spaces, and homotopy.- 4-Manifolds, group invariants, and ? 2-Betti numbers.- The Euler characteristic — a few highlights in its long history.- Topology, algebra, analysis — relations and missing links.- to ?2-methods in topology: Reduced ?2-homology, harmonic chains, ?2-Betti numbers.- Die Zukunft der Mathematik Ein Rückblick auf Hilberts programmatischen Vortrag vor 100 Jahren.- Kolmogorov and contemporary mathematics.- Is algebraic topology a respectable field?.- Social choice and topology. A case of pure and applied mathematics.
