Abstract
An acyclic edge coloring of a graph is a proper edge coloring such that every cycle contains edges of at least three distinct colors. The acyclic chromatic index of a graph G, denoted by a′(G), is the minimum number k such that there is an acyclic edge coloring using k colors. It is known that a′(G) ≤ 16Δ for every graph G where Δ denotes the maximum degree of G. We prove that a′(G) < 13.8Δ for an arbitrary graph G. We also reduce the upper bounds of a′(G) to 9.8Δ and 9Δ with girth 5 and 7, respectively.
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Supported by the National Natural Science Foundation of China (No. 11371355).
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Wu, Yw., Yan, Gy. Improved upper bounds on acyclic edge colorings. Acta Math. Appl. Sin. Engl. Ser. 30, 305–308 (2014). https://doi.org/10.1007/s10255-014-0293-z
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DOI: https://doi.org/10.1007/s10255-014-0293-z