#exotic_sphere
Exotic sphere
Smooth manifold that is homeomorphic but not diffeomorphic to a sphere
In an area of mathematics called differential topology, an exotic sphere is a differentiable manifold M that is homeomorphic but not diffeomorphic to the standard Euclidean n-sphere. That is, M is a sphere from the point of view of all its topological properties, but carrying a smooth structure that is not the familiar one.
Thu 8th
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