Sy-David Friedman
Professor Sy Friedman before a lecture during The First European Set Theory Meeting, Będlewo (Poland), July 2007
Born	(1953-05-06) May 6, 1953 (age 71) Chicago
Nationality	American/Austrian
Alma mater	MIT
Known for	Mathematical logic, Set theory, Large cardinal property
Scientific career
Fields	Mathematician
Institutions	University of Vienna
Doctoral advisor	Gerald E. Sacks

Sy-David Friedman (born May 23, 1953, in Chicago) is an American and Austrian mathematician and a (retired) professor of mathematics at the University of Vienna and the former director of the Kurt Gödel Research Center for Mathematical Logic. His main research interest lies in mathematical logic, in particular in set theory and recursion theory.

Friedman is the brother of Ilene Friedman and the brother of mathematician Harvey Friedman.

He studied at Northwestern University and, from 1970, at the Massachusetts Institute of Technology. He received his Ph.D. in 1976 from MIT (his thesis Recursion on Inadmissible Ordinals was written under the supervision of Gerald E. Sacks).

In 1979, Sy Friedman accepted a position at MIT, and in 1990 he became a full professor there. Since 1999, he has been a professor of mathematical logic at the University of Vienna, and he retired in 2018.^[1] He is a Fellow of Collegium Invisibile.^[2]

He has authored about 70 research articles, including:

• Friedman, Sy D. (1981). "Negative solutions to Post's problem. II". Annals of Mathematics. Second Series. 113 (1): 25–43. doi:10.2307/1971132. JSTOR 1971132.
• Friedman, Sy (1985). "A guide to "Coding the Universe" by Beller, Jensen, Welch". Journal of Symbolic Logic. 50 (4): 1002–1019. doi:10.2307/2273986. JSTOR 2273986.
• Friedman, Sy D. (1990). "The ${\displaystyle \Pi _{2}^{1}}$-singleton conjecture". J. Amer. Math. Soc. 3 (4): 771–791. doi:10.1090/S0894-0347-1990-1071116-6.
• Friedman, Sy D (2005). "Genericity and large cardinals". J. Math. Log. 5 (2): 149–166. CiteSeerX 10.1.1.23.9437. doi:10.1142/S0219061305000420.

He also published a research monograph

• Friedman, Sy D. (2000). Fine structure and class forcing. de Gruyter Series in Logic and its Applications. Vol. 3. Berlin: Walter de Gruyter & Co. ISBN 978-3-11-016777-1.

• Sy Friedman at the Mathematics Genealogy Project

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