Online ramsey games in random graphs

  • Authors:
  • Martin Marciniszyn;Reto SpÖhel;Angelika Steger

  • Affiliations:
  • Institute of theoretical computer science, eth zürich, 8092 zürich, switzerland (e-mail: mmarcini@inf.ethz.ch, rspoehel@inf.ethz.ch, steger@inf.ethz.ch);Institute of theoretical computer science, eth zürich, 8092 zürich, switzerland (e-mail: mmarcini@inf.ethz.ch, rspoehel@inf.ethz.ch, steger@inf.ethz.ch);Institute of theoretical computer science, eth zürich, 8092 zürich, switzerland (e-mail: mmarcini@inf.ethz.ch, rspoehel@inf.ethz.ch, steger@inf.ethz.ch)

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 2009

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Abstract

Consider the following one-player game. Starting with the empty graph on n vertices, in every step a new edge is drawn uniformly at random and inserted into the current graph. This edge has to be coloured immediately with one of r available colours. The player's goal is to avoid creating a monochromatic copy of some fixed graph F for as long as possible. We prove a lower bound of nβ(F,r) on the typical duration of this game, where β(F,r) is a function that is strictly increasing in r and satisfies limr→∞ β(F,r) = 2 − 1/m2(F), where n2−1/m2(F) is the threshold of the corresponding offline colouring problem.