Colloquium held the University of Geneva, 26-28 March, 1969
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Memories dedies a fliger ]et[ Raghavan Narasimhan
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CONTENTS.-Les travaus de George de Rham sur les varietes differntiabes, by H. Cartan.-Torison et type simple dhomotopie. By J. Minor and O. Burlet..-Spin-manifolds and group actions, byM. Atiyah and F. Hirzeburuch. on the zeroes of meromorphic vector fields. byP. F. Baum and R, Bott. Some formulas related to aompiex trasgression, by R. Bott and S. S. Chern. -On homotopy k3 surfaces, by K. Kodaira.-Pseudo-concavite et groupes arithmetiques, by A. Borel. Some remarks on pseudoconcave manifolds, by A. Andrreotti and G. Tomssini.-Trajectories convexes de groups offines unimodulaires, by J. L. Koszul.-Maximum theorems for spectra, by E. Vesentini.-Differentiable closed embeddings of Banach manifolds, by N. H. Kuiper and B, terpstra -Keppler.-On invariant subests of hyperbolic stes, by M. W. Hirsch.-Semi-free and Petrie .-Pontrjagin classes, the fundamental group and some problems of stable algebra . by S. P. Novikov.-Plongements differentiables des varites orintees de dimension 4 dans R, by J, Boechat and A. Haefliger.-Taming complexes in the metastable range, by C. Weber.-Le groupe des types simples dhomotopie sur un poledre, Weber.-Le groupe des type simples dhomotopie sur un polyedre, by B. Eckmann and S. Maumary.-Sur le groupe des automore phismes dun arbre, By J. Tits .-Multiplicateurs de Schur et Ktheorie . by M. A. Kervaire .-Topolog