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Abstract:
For a graph G and two positive integers t,r, a (t,t+r)-list assignment of G is a function L that assigns a set of permissible colors L(u) to every vertex u such that |L(u)|≥t and |L(u)∪L(w)|≥t+r when uw is an edge. The graph G is said to be (t,t+r)-choosable if G allows a proper coloring ψ satisfying ψ(u)∈L(u) for each u∈V(G) and each (t,t+r)-list assignment L of G. In this paper, we consider the (2,2+r)-choosability of planar graphs without short cycles. We show that: (1) if G is a planar graph contains no cycles of length 4, then G is (2,9)-choosable; (2) if G is a planar graph contains no cycles of lengths 4 and 5, then G is (2,7)-choosable. © 2022 Elsevier Inc.
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Applied Mathematics and Computation
ISSN: 0096-3003
Year: 2023
Volume: 444
3 . 5
JCR@2023
3 . 5 0 0
JCR@2023
ESI HC Threshold:13
JCR Journal Grade:1
CAS Journal Grade:2
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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