On indecomposability preserving elimination sequences

  • Authors:
  • Chandan K. Dubey;Shashank K. Mehta

  • Affiliations:
  • Indian Institute of Technology, Kanpur, India;Indian Institute of Technology, Kanpur, India

  • Venue:
  • COCOON'06 Proceedings of the 12th annual international conference on Computing and Combinatorics
  • Year:
  • 2006

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Abstract

A module of a graph is a non-empty subset of vertices such that every non-module vertex is either connected to all or none of the module vertices. An indecomposable graph contains no non-trivial module (modules of cardinality 1 and |V| are trivial). We present an algorithm to compute indecomposability preserving elimination sequence, which is faster by a factor of |V| compared to the algorithms based on earlier published work. The algorithm is based on a constructive proof of Ille’s theorem [9]. The proof uses the properties of X-critical graphs, a generalization of critical indecomposable graphs.