14 June 1963|
|Died||13 January 2011
|Residence||Australia, United States|
|Fields||Mathematics, set theory, logic|
|Institutions||University of Melbourne
University of California
|Doctoral advisor||William Hugh Woodin|
|Known for||Hjorth's theory of turbulence|
|Notable awards||First Sacks Prize from the Association for Symbolic Logic (ASL) (1993); Sloan Foundation Fellowship 1998; An invitation to the International Congress of Mathematicians (1998); The Karp Prize of the ASL (2003); Invited key speaker to the Alfred Tarski Lectures at UC Berkeley|
Greg Hjorth (14 June 1963 – 13 January 2011) was an Australian Professor of Mathematics, chess International Master (1984) and joint (with Ian Rogers) Commonwealth Champion in 1983. He worked in the field of mathematical logic.
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.
Hjorth died of a heart attack in Melbourne, on 13 January 2011.
- G. Hjorth: Classification and Orbit Equivalence Relations, Mathematical Surveys and Monographs, 75, American Mathematical Society, Providence, Rhode Island, 2000.
- "In memoriam Greg Hjorth, Professor of Mathematics, 1963–2011 UCLA Department of Mathematics". Ucla.edu. Retrieved 21 May 2011.
- "The chess games of Greg Hjorth". ChessGames.com. Retrieved 21 May 2011.
- Zach, Richard (28 January 2011). "Gregory Hjorth, 1963–2011". University of Calgary. Retrieved 21 May 2011.
- "Personnel Department of Mathematics and Statistics: Professor Greg Hjorth". The University of Melbourne. Retrieved 21 May 2011.
- "Men's Chess Olympiads: Gregory Hjorth". OlimpBase. Retrieved 21 May 2011.
- Sonas, Jeff. "Event Details: Amsterdam (OHRA), 1984". ChessMetrics. Retrieved 21 May 2011.
- Greg Hjorth's webpage at UCLA
- Greg Hjorth player profile and games at Chessgames.com
- Chessmetrics Player Profile: Greg Hjorth
- IM Greg Hjorth interviewed by FM Grant Szuveges
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