A new upper bound for the bipartite Ramsey problem

  • Authors:
  • David Conlon

  • Affiliations:
  • St John's College, Cambridge, United Kingdom

  • Venue:
  • Journal of Graph Theory
  • Year:
  • 2008

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Abstract

We consider the following question: how large does n haveto be to guarantee that in any two-coloring of the edges of thecomplete graph Kn,n there is amonochromatic Kk,k? In the late 1970s,Irving showed that it was sufficient, for k large, thatn ≥ 2k - 1 (k - 1) - 1. Here weimprove upon this bound, showing that it is sufficient to take$${n} \geq ({1} + {o}({1})) {2}^{{k}+ {1}}\; {\log}\; {k},$$ wherethe log is taken to the base 2. © 2008 Wiley Periodicals, Inc.J Graph Theory 58: 351356, 2008