An Information-Theoretic Upper Bound of Planar Graphs Using Triangulation
An Information-Theoretic Upper Bound of Planar Graphs Using Triangulation
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使用三角测量的平面图的信息论上限
DOI:
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发表时间:
2003
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通讯作者:
Nicolas Hanusse
中科院分区:
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作者:
Nicolas Bonichon;C. Gavoille;Nicolas Hanusse
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?n+O(log n), where ? ? 5.007. The current lower bound is 2sn+?(log n) for s ? 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.