Improved random graph isomorphism

  • Authors:
  • Tomek Czajka;Gopal Pandurangan

  • Affiliations:
  • Department of Computer Science, Purdue University, 250 N. Univ St., West Lafayette, IN 47907, USA;Department of Computer Science, Purdue University, 250 N. Univ St., West Lafayette, IN 47907, USA

  • Venue:
  • Journal of Discrete Algorithms
  • Year:
  • 2008

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Abstract

Canonical labeling of a graph consists of assigning a unique label to each vertex such that the labels are invariant under isomorphism. Such a labeling can be used to solve the graph isomorphism problem. We give a simple, linear time, high probability algorithm for the canonical labeling of a G(n,p) random graph for p@?[@w(ln^4n/nlnlnn),1-@w(ln^4n/nlnlnn)]. Our result covers a gap in the range of p in which no algorithm was known to work with high probability. Together with a previous result by Bollobas, the random graph isomorphism problem can be solved efficiently for p@?[@Q(lnn/n),1-@Q(lnn/n)].