A 1.235 lower bound on the number of points needed to draw all n-vertex planar graphs

  • Authors:
  • Maciej Kurowski

  • Affiliations:
  • Institute of Informatics, Warsaw University, Banacha 2, 02-097 Warsaw, Poland

  • Venue:
  • Information Processing Letters
  • Year:
  • 2004

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Abstract

We study a problem of lower bounds on straight line drawings of planar graphs. We show that at least 1.235 ċ n points in the plane are required to draw each n-vertex planar graph with edges drawn as straight line segments (for sufficiently large n). This improves the previous best bound of 1.206 ċ n (for sufficiently large n) due to Chrobak and Karloff [Sigact News 20 (4) (1989) 83-86]. Our contribution is twofold: we improve the lower bound itself and we give a significantly simpler and more straightforward proof.