Equitable list colorings of planar graphs without short cycles

  • Authors:
  • Junlei Zhu;Yuehua Bu

  • Affiliations:
  • Department of Mathematics, Jiaxing University, Jiaxing, 314001, PR China;Department of Mathematics, Zhejiang Normal University, Jinhua, 321004, PR China

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2008

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Abstract

A graph G is equitably k-choosable if, for any k-uniform list assignment L, G is L-colorable and each color appears on at most @?|V(G)|k@? vertices. A graph G is equitably k-colorable if G has a proper k-vertex coloring such that the sizes of any two color classes differ by at most 1. In this paper, we prove that every planar graph G is equitably k-choosable and equitably k-colorable if one of the following conditions holds: (1) G is triangle-free and k=max{@D(G),8}; (2) G has no 4- and 5-cycles and k=max{@D(G),7}.