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International Congress of Mathematicians

International Congress of Mathematicians

International Congress of Mathematicians

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ICM 2002 • Vol. II • 315-321Some Applications <strong>of</strong> Collapsingwith Bounded CurvatureAnton Petrunin*AbstractIn my talk I will discuss the following results which were obtained injoint work with Wilderich Tüschniann.1. For any given numbers m, C and D, the class <strong>of</strong> m-dimensional simplyconnected closed smooth manifolds with finite second homotopy groups whichadmit a Riemannian metric with sectional curvature \K\ < C and diameter< D contains only finitely many diffeomorphism types.2. Given any rn and any S > 0, there exists a positive constant io =io(m,,S) > 0 such that the injectivity radius <strong>of</strong> any simply connected compactm-dimensional Riemannian manifold with finite second homotopy group andRicci curvature Rie >S,K

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