n -Tuple Coloring of Planar Graphs with Large Odd Girth
Author(s) -
William F. Klostermeyer,
Cun Quan Zhang
Publication year - 2002
Publication title -
graphs and combinatorics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 40
eISSN - 1435-5914
pISSN - 0911-0119
DOI - 10.1007/s003730200007
Subject(s) - combinatorics , mathematics , odd graph , planar graph , graph homomorphism , outerplanar graph , discrete mathematics , graph power , triangle free graph , butterfly graph , wheel graph , graph , vertex (graph theory) , 1 planar graph , line graph , pathwidth , voltage graph
. The main result of the papzer is that any planar graph with odd girth at least 10k−7 has a homomorphism to the Kneser graph G k 2 k +1, i.e. each vertex can be colored with k colors from the set {1,2,…,2k+1} so that adjacent vertices have no colors in common. Thus, for example, if the odd girth of a planar graph is at least 13, then the graph has a homomorphism to G 2 5, also known as the Petersen graph. Other similar results for planar graphs are also obtained with better bounds and additional restrictions.
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