The genus of the GRAY graph is 7

  • Authors:
  • Dragan Marušič;Tomaž Pisanski;Steve Wilson

  • Affiliations:
  • IMFM, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenija;IMFM, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenija;Northern Arizona University, Flagstaff, AZ

  • Venue:
  • European Journal of Combinatorics - Special issue: Topological graph theory II
  • Year:
  • 2005

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Abstract

Using the genus embedding of the Cartesian product of three triangles we prove one can embed the smallest cubic semisymmetric graph on 54 vertices, the so-called Gray graph, in the orientable surface of genus 7, and we prove that such an embedding is optimal.