Abstract
A proper edge coloring of a graph G is called acyclic if there is no 2-colored cycle in G. The acyclic chromatic index of G, denoted by x′ a (G), is the least number of colors such that G has an acyclic edge k-coloring. Let G be a graph with maximum degree Δ and girth g(G), and let 1 ⩽ r ⩽ 2Δ be an integer. In this paper, it is shown that there exists a constant c > 0 such that if \(g(G) \geqslant \frac{{c\Delta }} {r}\log \left( {\Delta ^2 /r} \right)\) then x′ a (G) ⩽ Δ+r + 1, which generalizes the result of Alon et al. in 2001. When G is restricted to series-parallel graphs, it is proved that x′ a (G) = Δ if Δ ⩾ 4 and g(G) ⩾ 4; or Δ ⩾ 3 and g(G) ⩾ 5.
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Lin, Q., Hou, J. & Liu, Y. Acyclic edge coloring of graphs with large girths. Sci. China Math. 55, 2593–2600 (2012). https://doi.org/10.1007/s11425-012-4442-7
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DOI: https://doi.org/10.1007/s11425-012-4442-7