The t-improper chromatic number of random graphs

  • Authors:
  • Ross j. Kang;Colin Mcdiarmid

  • Affiliations:
  • School of computer science, mcgill university, montréal, québec, h2a 2a7, canada (e-mail: rosskang@cs.mcgill.ca);Department of statistics, university of oxford, 1 south parks road, oxford ox1 3tg, uk (e-mail: cmcd@stats.ox.ac.uk)

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 2010

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Abstract

We consider the t-improper chromatic number of the Erdős–Rényi random graph Gn,p. The t-improper chromatic number χt(G) is the smallest number of colours needed in a colouring of the vertices in which each colour class induces a subgraph of maximum degree at most t. If t = 0, then this is the usual notion of proper colouring. When the edge probability p is constant, we provide a detailed description of the asymptotic behaviour of χt(Gn,p) over the range of choices for the growth of t = t(n).