Abstract
An acyclic colouring of a graph G is a proper vertex colouring such that every cycle uses at least three colours. For a list assignment L = {L(v)∼ v ∈ V(G)}, if there exists an acyclic colouring ρ such that ρ(v) ∈ L(v) for each v ∈ V(G), then ρ is called an acyclic L-list colouring of G. If there exists an acyclic L-list colouring of G for any L with ∣L(v)∣> k for each v ∈ V (G), then G is called acyclically k-choosable. In this paper, we prove that every graph with maximum degree Δ ≤ 7 is acyclically 13-choosable. This upper bound is first proposed. We also make a more compact proof of the result that every graph with maximum degree Δ ≤ 3 (resp., Δ ≤ 4) is acyclically 4-choosable (resp., 5-choosable).
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Supported by National Natural Science Foundation of China (Grant Nos. 11771443 and 11601510) and Shandong Province Natural Science Foundation (Grant No. ZR2017QF011)
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Wang, J., Miao, L.Y., Li, J.B. et al. Acyclic Choosability of Graphs with Bounded Degree. Acta. Math. Sin.-English Ser. 38, 560–570 (2022). https://doi.org/10.1007/s10114-022-0097-7
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DOI: https://doi.org/10.1007/s10114-022-0097-7