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Gerald Enoch Sacks (born 1933, "Brooklyn) is a "logician who holds a joint appointment at "Harvard University as a professor of "mathematical logic and the "Massachusetts Institute of Technology as a professor emeritus.[1][2] His most important contributions have been in "recursion theory. Named after him is "Sacks forcing, a "forcing notion based on "perfect sets[3] and the Sacks Density Theorem, which asserts that the partial order of the recursively enumerable Turing degrees is dense.[4]

Sacks earned his "Ph.D. in 1961 from "Cornell University under the direction of "J. Barkley Rosser, with a dissertation entitled On Suborderings of Degrees of Recursive Insolvability. Among his notable students are "Lenore Blum, "Harvey Friedman, "Sy Friedman, "Leo Harrington, "Richard Shore, "Steve Simpson and "Theodore Slaman.[5]

Selected publications[edit]


  1. ^ Short CV, retrieved 2015-06-26.
  2. ^ "Professor Gerald Sacks Retires from MIT" (PDF), Integral: News from the Mathematics Department at MIT, 1: 6, Autumn 2006 .
  3. ^ Halbeisen, Lorenz J. (2011), Combinatorial Set Theory: With a Gentle Introduction to Forcing, Springer Monographs in Mathematics, Springer, pp. 380–381, "ISBN "9781447121732 .
  4. ^ Soare, Robert I. (1987), Recursively Enumerable Sets and Degrees: A Study of Computable Functions and Computably Generated Sets, Perspectives in Mathematical Logic, Springer, p. 245, "ISBN "9783540152996 .
  5. ^ Gerald Sacks at the "Mathematics Genealogy Project
  6. ^ Review of Degrees of unsolvability by "Kenneth Appel, "MR0186554
  7. ^ Review of Saturated model theory by P. Stepanek, "MR0398817
  8. ^ Review of Higher recursion theory by Dag Normann, "MR1080970
  9. ^ Review of Selected logic papers by Dag Normann, "MR1783306

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