On powers of graphs of bounded NLC-width (clique-width)

  • Authors:
  • Karol Suchan;Ioan Todinca

  • Affiliations:
  • Faculty of Applied Mathematics, AGH - University of Science and Technology, Cracow, Poland and LIFO - Université d'Orléans, BP 6759, F-45067, France;LIFO - Université d'Orléans, BP 6759, F-45067, France

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2007

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Abstract

Given a graph G, the graph Gl has the same vertex setand two vertices are adjacent in Gl if and only if theyare at distance at most l in G. The l-coloring problem consists infinding an optimal vertex coloring of the graph Gl,where G is the input graph. We show that, for any fixed value of l,the l-coloring problem is polynomial when restricted to graphs ofbounded NLC-width (or clique-width), if an expression of the graphis also part of the input. We also prove that the NLC-width ofGl is at most 2(l+1)nlcw(G).