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  • ...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) - 12:23, 8 July 2009
  • ...X 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 (1,831 words) - 10:58, 5 February 2016

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