The 4-Acyclic Edge Coloring of Graphs with Large Girths


A proper edge coloring of a graph is acyclic, if every cycle of the graph has at least 3 colors. Let r be a positive integer. An edge coloring is r-acyclic if it is proper and every cycle C has at least  colors. The r-acyclic edge chromatic   number of a graph G is the minimum number of colors needed for any r-acyclic edge coloring of G. When r=4, the result of this paper is that the 4-acyclic chromatic number of a graph with maximum degree Δ and girth  is less than 18Δ. Furthermore, if the girth of graph G is at least , then .

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Wu, Y. and Xia, Y. (2015) The 4-Acyclic Edge Coloring of Graphs with Large Girths. Journal of Applied Mathematics and Physics, 3, 1594-1598. doi: 10.4236/jamp.2015.312183.

Conflicts of Interest

The authors declare no conflicts of interest.


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