An Information-Theoretic Upper Bound of Planar Graphs Using Triangulation

  • Authors:
  • Nicolas Bonichon;Cyril Gavoille;Nicolas Hanusse

  • Affiliations:
  • -;-;-

  • Venue:
  • STACS '03 Proceedings of the 20th Annual Symposium on Theoretical Aspects of Computer Science
  • Year:
  • 2003

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Abstract

We propose a new linear time algorithm to represent a planar graph. Based on a specific triangulation of the graph, our coding takes on average 5.03 bits per node, and 3.37 bits per node if the graph is maximal. We derive from this representation that the number of unlabeled planar graphs with n nodes is at most 2驴n+O(log n), where 驴 驴 5.007. The current lower bound is 2脽n+驴(log n) for 脽 驴 4.71. We also show that almost all unlabeled and almost all labeled n-node planar graphs have at least 1.70n edges and at most 2.54n edges.