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Greg Hjorth
Greg Hjorth (14 June 1963 – 13 January 2011) was an Australian Professor of Mathematics,〔(【引用サイトリンク】title=In memoriam Greg Hjorth, Professor of Mathematics, 1963–2011 UCLA Department of Mathematics )〕 chess International Master (1984) and joint (with Ian Rogers) Commonwealth Champion in 1983.〔(【引用サイトリンク】title=The chess games of Greg Hjorth )〕 He worked in the field of mathematical logic.〔(【引用サイトリンク】title=Personnel Department of Mathematics and Statistics: Professor Greg Hjorth )〕 ==Mathematical career== Hjorth earned his Ph.D. in 1993, under the direction of W. Hugh Woodin, with a dissertation entitled ''On the influence of second uniform indiscernible''. He held faculty positions at the University of California, Los Angeles and the University of Melbourne. Among his most important contributions to set theory was the so-called theory of ''turbulence'', used in the theory of Borel equivalence relations.
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