A characterization of planar graphs by pseudo-line arrangements

Hisao Tamaki, Takeshi Tokuyama

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Let Γ be an arrangement of pseudo-lines, i.e., a collection of unbounded x-monotone curves in which each curve crosses each of the others exactly once. A pseudo-line graph (Γ, E) is a graph for which the vertices are the pseudo-lines of Γ and the edges are some unordered pairs of pseudo-lines of Γ. A diamond of a pseudo-line graph (Γ, E) is a pair of edges {p, q}, {p′, q′} ∈ E, {p, q} ∩ {p′, q′} = Ø, such that the crossing point of the pseudo-lines p and q lies vertically between p′ and q′ and the crossing point of p′ and q′ lies vertically between p and q. We show that a graph is planar if and only if it is isomorphic to a diamond-free pseudo-line graph. An immediate consequence of this theorem is that the O(k1/3 n) upper bound on the k-level complexity of an arrangement of straight lines, which was very recently discovered by Dey, holds for an arrangement of pseudo-lines as well.

Original languageEnglish
Pages (from-to)269-285
Number of pages17
JournalAlgorithmica (New York)
Issue number3
Publication statusPublished - 2003 Mar 1


  • Geometric graph theory
  • Planar graph
  • Pseudo-line arrangement
  • k-Level complexity

ASJC Scopus subject areas

  • Computer Science(all)
  • Computer Science Applications
  • Applied Mathematics


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