A Complete Characterisation of the Linear Clique-Width of Path Powers

  • Authors:
  • Pinar Heggernes;Daniel Meister;Charis Papadopoulos

  • Affiliations:
  • Department of Informatics, University of Bergen, Norway;Department of Informatics, University of Bergen, Norway;Department of Mathematics, University of Ioannina, Greece

  • Venue:
  • TAMC '09 Proceedings of the 6th Annual Conference on Theory and Applications of Models of Computation
  • Year:
  • 2009

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Abstract

A k -path power is the k -power graph of a simple path of arbitrary length. Path powers form a non-trivial subclass of proper interval graphs. Their clique-width is not bounded by a constant, and no polynomial-time algorithm is known for computing their clique-width or linear clique-width. We show that k -path powers above a certain size have linear clique-width exactly k + 2, providing the first complete characterisation of the linear clique-width of a graph class of unbounded clique-width. Our characterisation results in a simple linear-time algorithm for computing the linear clique-width of all path powers.