The χ-Boundedness of P2∪P3-Free Graphs

Xiao Wang, Donghan Zhang and Serkan Araci

Journal of Mathematics, 2022, vol. 2022, 1-8

Abstract: In the early 1980s, Gyárfás introduced the concept of the χ-bound with χ-binding functions thereby extending the notion of perfectness. There are a number of challenging conjectures about the χ-bound. Let χG, ωG, and ΔG be the chromatic number, clique number, and maximum degree of a graph G, respectively. In this paper, we prove that if G is a triangle-free and P2∪P3-free graph, then χG≤3 unless G is one of eight graphs with ΔG=5 and χG=4, where the eight graphs are extended from the Grötzsch graph as a Mycielskian of a 5-cycle graph. Moreover, we also show that χG≤3ωG if G is a P2∪P3,W4-free graph.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jjmath:2071887

DOI: 10.1155/2022/2071887

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