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author:

Hou, Jianfeng (Hou, Jianfeng.) [1] | Zhu, Hongguo (Zhu, Hongguo.) [2]

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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.

Keyword:

Graphic methods Graph theory

Community:

  • [ 1 ] [Hou, Jianfeng]Center for Discrete Mathematics, Fuzhou University, Fujian; 350003, China
  • [ 2 ] [Zhu, Hongguo]Department of Mathematics, Zhejiang Normal University, Zhejiang; 321004, China

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Source :

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

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count:

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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