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Herbert Ryser : ウィキペディア英語版 | H. J. Ryser
Herbert John Ryser (July 28, 1923, Milwaukee, Wisconsin – July 12, 1985, Pasadena, California) was a professor of mathematics, widely regarded as one of the major figures in combinatorics in the 20th century.〔(Ryser's biography ) at the Ohio State University website〕 He is the namesake of the Bruck–Ryser–Chowla theorem and Ryser's formula for the computation of the permanent of a matrix. ==Early life== Ryser was born to the family of Fred G. and Edna (Huels) Ryser. He received the B.A. (1945), M.A. (1947), and Ph.D. (1948) from the University of Wisconsin.〔Richard A. Brualdi: "In memoriam: Herbert J. Ryser", ''Journal of Combinatorial Theory Series A'' 47(1) (January 1988), pp. 1–5〕 His doctoral thesis "Rational Vector Spaces" was supervised by Cornelius Joseph Everett, Jr. and Cyrus C. MacDuffee. (Ryser was Everett's only doctoral student.)
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