First-Fit coloring of {P5,K4-e}-free graphs

  • Authors:
  • S. A. Choudum;T. Karthick

  • Affiliations:
  • Department of Mathematics, Indian Institute of Technology Madras, Chennai - 600 036, India;Department of Mathematics, Indian Institute of Technology Madras, Chennai - 600 036, India

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2010

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Abstract

We show that given any ordering of the vertices of a {P"5,K"4-e}-free graph G, the First-Fit coloring algorithm colors its vertices using at most 2@w(G)-1 colors (where @w(G) is the clique number of G) via a characterization proved by using the known results. We also construct {P"5,K"4-e}-free graphs to show that this bound cannot be improved. A similar result is proved for the class of {P"5,paw}-free graphs.