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Published December 11, 2009 | Submitted + Published
Journal Article Open

On-line Ramsey Numbers


Consider the following game between two players, Builder and Painter. Builder draws edges one at a time and Painter colors them in either red or blue, as each appears. Builder's aim is to force Painter to draw a monochromatic copy of a fixed graph G. The minimum number of edges which Builder must draw, regardless of Painter's strategy, in order to guarantee that this happens is known as the on-line Ramsey number ˜r(G) of G. Our main result, relating to the conjecture that [equation; see abstract in PDF for details], is that there exists a constant c > 1 such that [equation; see abstract in PDF for details] for infinitely many values of t. We also prove a more specific upper bound for this number, showing that there exists a positive constant c such that [equation; see abstract in PDF for details]. Finally, we prove a new upper bound for the on-line Ramsey number of the complete bipartite graph K_(t,t).

Additional Information

© 2009 Society for Industrial and Applied Mathematics. Submitted 10 February 2009; accepted 08 September 2009; published online 11 December 2009. The author was supported by a Junior Research Fellowship at St. John's College, Cambridge. I would like to thank Jacob Fox for reading carefully through an earlier version of this paper and making several helpful suggestions.

Attached Files

Published - 090749220.pdf

Submitted - 0902.1715.pdf


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