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author:

Chen, Rong (Chen, Rong.) [1] (Scholars:陈容) | Zhou, Yidong (Zhou, Yidong.) [2]

Indexed by:

Scopus SCIE

Abstract:

We say that a graph G has an odd K-4 -subdivision if some subgraph of G is isomorphic to a K-4 -subdivision which if embedded in the plane the boundary of each of its faces has odd length and is an induced cycle of G. For a number l >= 2, let ge denote the family of graphs which have girth 2l + 1 and have no odd hole with length greater than 2l + 1. Wu, Xu and Xu conjectured that every graph in U (l >= 2) g(l) is 3 -colorable. Recently, Chudnovsky et al. and Wu et al., respectively, proved that every graph in g(2) and g(3) is 3 -colorable. In this paper, we prove that no 4 -vertex -critical graph in Ue>5 ge has an odd K-4 -subdivision. Using this result, Chen proved that all graphs in U-l>5 ge are 3 -colorable.

Keyword:

chromatic number odd holes

Community:

  • [ 1 ] [Chen, Rong]Fuzhou Univ, Ctr Discrete Math, Fuzhou, Peoples R China
  • [ 2 ] [Zhou, Yidong]Fuzhou Univ, Ctr Discrete Math, Fuzhou, Peoples R China

Reprint 's Address:

  • 陈容

    [Chen, Rong]Fuzhou Univ, Ctr Discrete Math, Fuzhou, Peoples R China

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Source :

ELECTRONIC JOURNAL OF COMBINATORICS

ISSN: 1077-8926

Year: 2024

Issue: 1

Volume: 31

0 . 7 0 0

JCR@2023

CAS Journal Grade:4

Cited Count:

WoS CC Cited Count:

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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