On total 9-coloring planar graphs of maximum degree seven

  • Authors:
  • Daniel P. Sanders;Yue Zhao

  • Affiliations:
  • Department of Mathematics, The Ohio State University, Columbus, Ohio 43210-1174;Department of Mathematics, Tulane University, New Orleans, Louisiana 70118

  • Venue:
  • Journal of Graph Theory
  • Year:
  • 1999

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Abstract

Given a graph G, a total k-coloring of G isa simultaneous coloring of the vertices and edges of G withat most k colors. If Δ(G) is the maximum degreeof G, then no graph has a total Δ-coloring, but Vizingconjectured that every graph has a total (Δ + 2)-coloring.This Total Coloring Conjecture remains open even for planar graphs.This article proves one of the two remaining planar cases, showingthat every planar (and projective) graph with Δ ≤ 7 has atotal 9-coloring by means of the discharging method. © 1999John Wiley & Sons, Inc. J Graph Theory 31: 6773, 1999