Abstract
A vertex coloring of a graph \(G\) is called acyclic if it is a proper vertex coloring such that every cycle \(C\) receives at least three colors. The acyclic chromatic number of \(G\) is the least number of colors in an acyclic coloring of \(G\). We prove that acyclic chromatic number of any graph \(G\) with maximum degree \(\Delta \ge 4\) and with girth at least \(4\Delta \) is at most \(12\Delta \).
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Acknowledgments
We would like to thank the reviewers for providing some very helpful suggestions for revising this paper. This work is supported by NSFSD (ZR2013AM001, ZR2013AL016) and NSFC (11371355).
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Cai, J., Feng, B. & Yan, G. Acyclic coloring of graphs with some girth restriction. J Comb Optim 31, 1399–1404 (2016). https://doi.org/10.1007/s10878-015-9829-2
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DOI: https://doi.org/10.1007/s10878-015-9829-2