The modular decomposition of countable graphs: constructions in monadic second-order logic

  • Authors:
  • Bruno Courcelle;Christian Delhommé

  • Affiliations:
  • LaBRI CNRS, Université Bordeaux 1;ERMIT, Université de La Réunion

  • Venue:
  • CSL'05 Proceedings of the 19th international conference on Computer Science Logic
  • Year:
  • 2005

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Abstract

We show that the modular decomposition of a countable graph can be defined from this graph, given with an enumeration of its set of vertices, by formulas of Monadic Second-Order logic. A second main result is the definition of a representation of modular decompositions by a low degree relational structures, also constructible by Monadic Second-Order formulas.