Abstract
Let brk(C4;Kn, n) be the smallest N such that if all edges of KN, N are colored by k + 1 colors, then there is a monochromatic C4 in one of the first k colors or a monochromatic Kn, n in the last color. It is shown that brk(C4;Kn, n) = Θ(n2/log2n) for k⩾3, and br2(C4;Kn, n)≥c(n n/log2n)2 for large n. The main part of the proof is an algorithm to bound the number of large Kn, n in quasi-random graphs. © 2010 Wiley Periodicals, Inc. J Graph Theory 67: 47-54, 2011 © 2011 Wiley Periodicals, Inc.
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