Dominating induced matchings for p

  • Authors:
  • Andreas Brandstädt

  • Affiliations:
  • Institut für Informatik, Universität Rostock, Rostock, Germany

  • Venue:
  • ISAAC'11 Proceedings of the 22nd international conference on Algorithms and Computation
  • Year:
  • 2011

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Abstract

Let G be a finite undirected graph with edge set E. An edge set E′⊆E is an induced matching in G if the pairwise distance of the edges of E′ in G is at least two; E′ is dominating in G if every edge e∈E&∖E′ intersects some edge in E′. The Dominating Induced Matching Problem (DIM, for short) asks for the existence of an induced matching E′ which is also dominating in G; this problem is also known as the Efficient Edge Domination Problem. The DIM problem is related to parallel resource allocation problems, encoding theory and network routing. It is $\mathbb{NP}$-complete even for very restricted graph classes such as planar bipartite graphs with maximum degree three. However, its complexity was open for Pk-free graphs for any k≥5; Pk denotes a chordless path with k vertices and k−1 edges. We show in this paper that the weighted DIM problem is solvable in linear time for P7-free graphs in a robust way.