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| death_place = New York City | nationality = American | fields = Mathematics | workplaces = Columbia University | alma_mater = | doctoral_advisor = Felix Klein David Hilbert | doctoral_students = John De Cicco Rufus Isaacs Joseph Ritt Jesse Douglas Edna Kramer | known_for = Kasner metric Kasner polygon "googol" | awards = }} Edward Kasner (April 2, 1878 – January 7, 1955) was a prominent American mathematician who was appointed Tutor on Mathematics in the Columbia University Mathematics Department. Kasner was the first Jew appointed to a faculty position in the sciences at Columbia University.〔Columbia and the "Jewish Problem” http://web.archive.org/web/20121221005651/http://beatl.barnard.columbia.edu/stand_columbia/TimelineCUJew.html〕 Subsequently, he became an adjunct professor in 1906, and a full professor in 1910, at the university. Differential geometry was his main field of study. In addition to introducing the term "googol", he is known also for the Kasner metric and the Kasner polygon.〔Douglas, Jesse (1958) (Edward Kasner, A Biographical Memoir ) prepared for the ''National Academy of Sciences''.〕 Kasner's PhD dissertation was titled ''The Invariant Theory of the Inversion Group: Geometry upon a Quadric Surface''; it was published by the American Mathematical Society in 1900 in their ''Transactions''. == Googol and googolplex == Kasner is perhaps best remembered today for introducing the term "googol." In order to pique the interest of children, Kasner sought a name for a very large number: one followed by a hundred zeros. On a walk in the New Jersey Palisades with his nephews, Milton (born 1911)〔There have been several dates reported in the literature, ranging from 1911 to 1929, but only 1911 is consistent with family records (Bialik).〕 and Edwin Sirotta, Kasner asked for their ideas. Nine-year-old Milton suggested "googol."〔 (retrieved March 17, 2015)〕 In 1940, with James R. Newman, Kasner co-wrote a non-technical book surveying the field of mathematics, called ''Mathematics and the Imagination'' (ISBN 0-486-41703-4). It was in this book that the term "googol" was first introduced: 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「Edward Kasner」の詳細全文を読む スポンサード リンク
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