Quasirandomness, Counting and Regularity for 3-Uniform Hypergraphs

  • Authors:
  • W. T. Gowers

  • Affiliations:
  • Department of Pure Mathematics and Mathematical Statistics, Wilberforce Road, Cambridge CB3 0WB, UK (e-mail: W.T.Gowers@dpmms.cam.ac.uk)

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 2006

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Abstract

The main results of this paper are regularity and counting lemmas for 3-uniform hypergraphs. A combination of these two results gives a new proof of a theorem of Frankl and Rödl, of which Szemerédi's theorem for arithmetic progressions of length 4 is a notable consequence. Frankl and Rödl also prove regularity and counting lemmas, but the proofs here, and even the statements, are significantly different. Also included in this paper is a proof of Szemerédi's regularity lemma, some basic facts about quasirandomness for graphs and hypergraphs, and detailed explanations of the motivation for the definitions used.