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Boxicity of Halin graphs

Published: 01 May 2009 Publication History

Abstract

A k-dimensional box is the Cartesian product R"1xR"2x...xR"k where each R"i is a closed interval on the real line. The boxicity of a graph G, denoted as box(G) is the minimum integer k such that G is the intersection graph of a collection of k-dimensional boxes. Halin graphs are the graphs formed by taking a tree with no degree 2 vertex and then connecting its leaves to form a cycle in such a way that the graph has a planar embedding. We prove that if G is a Halin graph that is not isomorphic to K"4, then box(G)=2. In fact, we prove the stronger result that if G is a planar graph formed by connecting the leaves of any tree in a simple cycle, then box(G)=2 unless G is isomorphic to K"4 (in which case its boxicity is 1).

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Cited By

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  • (2011)Contact representations of planar graphs with cubesProceedings of the twenty-seventh annual symposium on Computational geometry10.1145/1998196.1998250(315-320)Online publication date: 13-Jun-2011

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Published In

cover image Discrete Mathematics
Discrete Mathematics  Volume 309, Issue 10
May, 2009
502 pages

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Elsevier Science Publishers B. V.

Netherlands

Publication History

Published: 01 May 2009

Author Tags

  1. Boxicity
  2. Halin graphs
  3. Intersection graphs
  4. Planar graphs

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  • (2011)Contact representations of planar graphs with cubesProceedings of the twenty-seventh annual symposium on Computational geometry10.1145/1998196.1998250(315-320)Online publication date: 13-Jun-2011

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