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author:

Hou, Jianfeng (Hou, Jianfeng.) [1] (Scholars:侯建锋) | Zhu, Hongguo (Zhu, Hongguo.) [2]

Indexed by:

Scopus SCIE

Abstract:

For a graph G and a positive integer k, a k-list assignment of G is a function L on the vertices of G such that for each vertex v is an element of V(G), |L(v)| >= k. Let s be a nonnegative integer. Then L is a (k, k + s)-list assignment of G if |L(u) boolean OR L(v)| >= k + s for each edge uv. If for each (k, k + s)-list assignment L of G, G admits a proper coloring phi such that phi(v) is an element of L(v) for each v is an element of V(G), then we say G is (k, k + s)-choosable. This refinement of choosability is called choosability with union separation by Kumbhat et al. (2018), who showed that all planar graphs are (3, 11)-choosable and (4, 9)-choosable. In this paper, we prove that every triangle-free planar graph is (3, 7)-choosable. We also prove that every planar graph with girth at least 5 is (2, 7)-choosable. (c) 2020 Elsevier B.V. All rights reserved.

Keyword:

Choosability Discharge Planar graph Triangle

Community:

  • [ 1 ] [Hou, Jianfeng]Fuzhou Univ, Ctr Discrete Math, Fujian 350003, Peoples R China
  • [ 2 ] [Zhu, Hongguo]Fuzhou Univ, Ctr Discrete Math, Fujian 350003, Peoples R China

Reprint 's Address:

  • 朱洪国

    [Zhu, Hongguo]Fuzhou Univ, Ctr Discrete Math, Fujian 350003, Peoples R China

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Source :

DISCRETE MATHEMATICS

ISSN: 0012-365X

Year: 2020

Issue: 12

Volume: 343

0 . 8 7

JCR@2020

0 . 7 0 0

JCR@2023

ESI Discipline: MATHEMATICS;

ESI HC Threshold:50

JCR Journal Grade:3

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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