Curvature properties of exotic spheres
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== Introduction ==
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A homotopy sphere of dimension is an oriented closed smooth manifold which is homotopy equivalent to the standard sphere . A homotopy sphere is called an exotoc sphere if it not diffeoemeorphic to a standard sphere. General information about homotopy spheres (and exotoc spheres) is given on the map-page [[Exotic spheres]|Exotic spheres].