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- ...9X On finite Δ-systems II], H. L. Abbott and D. Hanson, Discrete Math. 17 (1977), 121-126. ...ction theorems for systems of sets, J. H. Spencer, Canad. Math. Bull. 20 (1977), 249-254. ...12 KB (1,842 words) - 14:26, 29 July 2020
- ...roved by Szemer\'edi in 1975 and given a different proof by Furstenberg in 1977. The Hales--Jewett theorem has a density version as well, proved by Fursten ...1 KB (202 words) - 13:23, 8 July 2009
