On the complexity of some subgraph problems

  • Authors:
  • Andrea Scozzari;Fabio Tardella

  • Affiliations:
  • Universití di Roma "La Sapienza", Dip. di Matematica per le Decisioni Economiche, Finanziarie ed Assicurative, Via del C. Laurenziano, 9, 00161 Roma, Italy;Universití di Roma "La Sapienza", Dip. di Matematica per le Decisioni Economiche, Finanziarie ed Assicurative, Via del C. Laurenziano, 9, 00161 Roma, Italy

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2009

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Abstract

We study the complexity of the problem of deciding the existence of a spanning subgraph of a given graph, and of that of finding a maximum (weight) such subgraph. We establish some general relations between these problems, and we use these relations to obtain new NP-completeness results for maximum (weight) spanning subgraph problems from analogous results for existence problems and from results in extremal graph theory. On the positive side, we provide a decomposition method for the maximum (weight) spanning chordal subgraph problem that can be used, e.g., to obtain a linear (or O(nlogn)) time algorithm for such problems in graphs with vertex degree bounded by 3.