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Local convexity and nonnegative curvature —Gromov's proof of the sphere theorem

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Dedicated to Wilhelm Klingenberg

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Eschenburg, J.H. Local convexity and nonnegative curvature —Gromov's proof of the sphere theorem. Invent Math 84, 507–522 (1986). https://doi.org/10.1007/BF01388744

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