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The study of differentiable manifolds and differentiable maps. One fundamental problem is that of classifying manifolds up to diffeomorphism. Differential topology is what Poincaré understood as topology or “analysis situs”.

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Intuition behind the following theorem of Reeb?

What is the intuition behind the following theorem of Reeb? If a compact manifold admits a function with only two critical points which are non degenerate, it is homeomorphic to the sphere.
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