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Allen Hatcher : ウィキペディア英語版 | Allen Hatcher
Allen Edward Hatcher (born 1944) is an American topologist and author. He received his Ph.D. under the supervision of Hans Samelson at Stanford University in 1971. He went on to become a professor in UCLA. Since 1983 he has been a professor at Cornell University. ==Mathematical contributions== His contributions include a proof of the Smale conjecture for the 3-sphere and important results in the theory of pseudoisotopy, K-theory, surfaces and 3-manifolds.
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