The recursively enumerable α-degrees are dense

The fine structure of the constructible hierarchy

Ronald Björn Jensen · Annals of Mathematical Logic · 1972 · 681 citations

Computing, Computer Science, Mathematics +10

Degrees of Unsolvability.

T. G. McLaughlin, Gerald E. Sacks · American Mathematical Monthly · 1965 · 217 citations

The Recursively Enumerable Degrees are Dense

Gerald E. Sacks · Annals of Mathematics · 1964 · 206 citations

Natural Sciences, Mathematics, Combinatorics +8

The α-finite injury method

Gerald E. Sacks, Stephen G. Simpson · Annals of Mathematical Logic · 1972 · 78 citations

Engineering, Computational Engineering, Mechanical Engineering +7

Post’s problem, admissible ordinals, and regularity

Gerald E. Sacks · Transactions of the American Mathematical Society · 1966 · 56 citations · Full text

Natural Sciences, Computer Science, Mathematics +13