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John Forbes Nash Jr. : ウィキペディア英語版
John Forbes Nash, Jr.

John Forbes Nash, Jr. (June 13, 1928 – May 23, 2015) was an American mathematician who made fundamental contributions to game theory, differential geometry, and the study of partial differential equations.〔(【引用サイトリンク】url=http://www.abelprize.no/nyheter/vis.html?tid=63589 )〕 Nash's work has provided insight into the factors that govern chance and decision making inside complex systems found in daily life.
His theories are used in economics, computing, evolutionary biology, artificial intelligence, accounting, computer science, games of skill, politics and military theory. Serving as a Senior Research Mathematician at Princeton University during the latter part of his life, he shared the 1994 Nobel Memorial Prize in Economic Sciences with game theorists Reinhard Selten and John Harsanyi. In 2015, he was awarded the Abel Prize for his work on nonlinear partial differential equations.
In 1959, Nash began showing clear signs of mental illness, and spent several years at psychiatric hospitals being treated for paranoid schizophrenia. After 1970, his condition slowly improved, allowing him to return to academic work by the mid-1980s.〔 His struggles with his illness and his recovery became the basis for Sylvia Nasar's biography, ''A Beautiful Mind'', as well as a film of the same name starring Russell Crowe.
On May 23, 2015, Nash and his wife, Alicia Nash, were killed in a car crash while riding in a taxi on the New Jersey Turnpike.
==Early life and education==
Nash was born on June 13, 1928, in Bluefield, West Virginia, United States. His father, John Forbes Nash, was an electrical engineer for the Appalachian Electric Power Company. His mother, Margaret Virginia (née Martin) Nash, had been a schoolteacher before she married. He was baptized in the Episcopal Church. He had a younger sister, Martha (born November 16, 1930).
Nash attended kindergarten and public school, and he learned from books provided by his parents and grandparents.〔 Nash's parents pursued opportunities to supplement their son's education, and arranged for him to take advanced mathematics courses at a local community college during his final year of high school. He attended Carnegie Institute of Technology through a full benefit of the ''George Westinghouse Scholarship'', initially majoring in chemical engineering. He switched to a chemistry major and eventually, at the advice of his teacher John Lighton Synge, to mathematics. After graduating in 1948 with both a B.S. and M.S. in mathematics, Nash accepted a scholarship to Princeton University, where he pursued further graduate studies in mathematics.〔
Nash's adviser and former Carnegie professor Richard Duffin wrote a letter of recommendation for Nash's entrance to Princeton stating, "He is a mathematical genius."〔(Nash recommendation letter at Princeton.edu )〕 Nash was accepted at Harvard University, however, the chairman of the mathematics department at Princeton, Solomon Lefschetz, offered him the John S. Kennedy fellowship, convincing Nash that Princeton valued him more.〔Nasar (2011), pp. 46–7.〕 Further, he considered Princeton more favorably because of its proximity to his family in Bluefield.〔 At Princeton, he began work on his equilibrium theory, later known as the Nash equilibrium.

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