On chromatic-choosable graphs

  • Authors:
  • Kyoji Ohba

  • Affiliations:
  • Department of Mathematics, Keio University, Hiyosi 3-14-1, Kohoku-Ku, Yokohama 223-8522, Japan

  • Venue:
  • Journal of Graph Theory
  • Year:
  • 2002

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Abstract

A graph is chromatic-choosable if its choice number coincides with its chromatic number. It is shown in this article that, for any graph G, if we join a sufficiently large complete graph to G, then we obtain a chromatic-choosable graph. As a consequence, if the chromatic number of a graph G is close enough to the number of vertices in G, then G is chromatic-choosable. We also propose a conjecture related to this fact. © 2002 Wiley Periodicals, Inc. J Graph Theory 40: 130–135, 2002