Stable sets in k-colorable P5-free graphs

  • Authors:
  • Frédéric Maffray

  • Affiliations:
  • C.N.R.S., Laboratoire G-SCOP, Grenoble, France

  • Venue:
  • Information Processing Letters
  • Year:
  • 2009

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Abstract

We show that, for fixed k, there is a polynomial-time algorithm that finds a maximum (or maximum-weight) stable set in any graph that belongs to the class of k-colorable P"5-free graphs, or, more generally, to the class of P"5-free graphs that contain no clique of size k+1. This is based on the following structural result: every connected k-colorable P"5-free graph has a vertex whose non-neighbors induce a (k-1)-colorable subgraph.