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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.
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ELECTRONIC JOURNAL OF COMBINATORICS
ISSN: 1077-8926
Year: 2024
Issue: 1
Volume: 31
0 . 7 0 0
JCR@2023
CAS Journal Grade:4
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1