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Stephen Smale


 

Stephen Smale (born July 15, 1930) is an American mathematician and winner of the Fields Medal in 1966. He made his reputation by a proof of the Poincare conjecture for all dimensions greater than 4; he later generalized the ideas in the proof to establish the h-cobordism theorem. Stephen Smale is also famous for the proof of sphere eversion. That is, turning a sphere inside out without creating any crease.

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