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Gustav A. Hedlund
Gustav Arnold Hedlund (1904–1993), an American mathematician, was one of the founders of symbolic and topological dynamics.
==Biography==
Hedlund was born May 7, 1904, in Somerville, Massachusetts. He did his undergraduate studies at Harvard University, earned a masters degree from Columbia University, and returned to Harvard for his doctoral studies. He was a student of Marston Morse, under whose supervision he received a Ph.D. in 1930 with thesis entitled "I. Geodesics on a Two-Dimensional Riemannian Manifold with Periodic Coefficients II. Poincare's Rotation Number and Morse's Type Number".〔.〕〔(G. A. Hedlund Papers, 1941-1945, 2008 ), Dolph Briscoe Center for American History, The University of Texas at Austin, retrieved 2011-09-10.〕〔.〕
While still studying at Columbia, Hedlund taught at Hunter College, and after receiving his doctorate he took a position at Bryn Mawr College, where he remained for nine years. From 1939 to 1948 he taught at the University of Virginia, after which he moved to Yale University. At Yale, he became the Philip Schuyler Beebe Professor of Mathematics, and chaired the mathematics department for ten years. He was also a member of the Institute for Advanced Study in Princeton, New Jersey, which he visited in 1933, 1938, and 1953.〔(Hedlund, Gustav A., Institute for Advanced Study )〕 He retired from Yale in 1972, but afterwards held a visiting professorship at Wesleyan University.〔〔
Hedlund died in 1993.〔 He has over 200 academic descendants, many of them through two of his students at Virginia, Walter Gottschalk and W. Roy Utz, Jr.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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