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Ralph Louis Cohen (born 1952) is an American mathematician, specializing in algebraic topology and differential topology.〔(【引用サイトリンク】title=Ralph L. Cohen )〕 ==Education and career== Cohen received his bachelor's degree from the University of Michigan and his Ph.D. in 1978 from Brandeis University under Edgar Henry Brown with thesis ''On Odd Primary Stable Homotopy Theory''. At Stanford University, he became in 1982 an assistant professor, was the chair of the mathematics department from 1992 to 1995, and is now the Barbara Kimball Browning Professor for Mathematics there.〔 From 1999 to 2009 he was the director of the Mathematics Research Center in Stanford. He was a visiting professor at Princeton, Oxford, Cambridge, Université Paris Diderot, Université Paris Nord, the University of Lille, and the University of Copenhagen.〔(Ralph Cohen, School of Humanities and Sciences, Stanford University )〕 In 1985 he proved the Immersion Conjecture (that each smooth, compact n-manifold has an immersion in Euclidean space of dimension 2(n)–α(n), where α(n) is the number of ones in the binary expansion of n). In 1995 Cohen, John D. S. Jones, and Graeme Segal introduced an approach for understanding the homotopy theory of Floer homology. In 2002 Cohen received the Distinguished Teaching Award from Stanford. In 1995 he was a founder of the Stanford University Math Camp (SUMaC), a summer camp for mathematically talented high school students. In 1982 Cohen was a Sloan Fellow. In 1983 he was an invited speaker at the International Congress of Mathematicians in Warsaw. In 1984 he received the Presidential Young Investigator Award. His doctoral students include Ulrike Tillmann and Ernesto Lupercio. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ralph Louis Cohen」の詳細全文を読む スポンサード リンク
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