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On-line Ramsey numbers for paths and stars

Abstract : We study on-line version of size-Ramsey numbers of graphs defined via a game played between Builder and Painter: in one round Builder joins two vertices by an edge and Painter paints it red or blue. The goal of Builder is to force Painter to create a monochromatic copy of a fixed graph H in as few rounds as possible. The minimum number of rounds (assuming both players play perfectly) is the on-line Ramsey number r(H) of the graph H. We determine exact values of r(H) for a few short paths and obtain a general upper bound r(Pn) ≤ 4n −7. We also study asymmetric version of this parameter when one of the target graphs is a star Sn with n edges. We prove that r(Sn, H) ≤ n*e(H) when H is any tree, cycle or clique
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J. A. Grytczuk, H. A. Kierstead, P. Prałat. On-line Ramsey numbers for paths and stars. Discrete Mathematics and Theoretical Computer Science, DMTCS, 2008, 10 (3), pp.63--74. ⟨hal-00972333⟩

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