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Chromatic Uniqueness of Certain Complete Tripartite Graphs

Chromatic Uniqueness of Certain Complete Tripartite Graphs

作     者:G. C. LAU Y. H. PENG 

作者机构:Faculty of Computer & Mathematical Sciences Universiti Teknologi MARA (Segamat Campus) 85100 Segamat Johor Malaysia Department of Mathematics and Institute for Mathematical Research Universiti Putra Malaysia 43400 UPM Serdang Malaysia 

出 版 物:《Acta Mathematica Sinica,English Series》 (数学学报(英文版))

年 卷 期:2011年第27卷第5期

页      面:919-926页

核心收录:

学科分类:07[理学] 070104[理学-应用数学] 0701[理学-数学] 

主  题:Complete tripartit graphs chromatic polynomial chromatic uniqueness 

摘      要:Let P(G,A) be the chromatic polynomial of a graph G. A graph G is chromatically unique if for any graph H, P(H, λ) = P(G, λ) implies H is isomorphic to G. Liu et al. [Liu, R. Y., Zhao, H. X., Ye, C. F.: A complete solution to a conjecture on chromatic uniqueness of complete tripartite graphs. Discrete Math., 289, 175 179 (2004)], and Lau and Peng [Lau, G. C., Peng, Y. H.: Chromatic uniqueness of certain complete t-partite graphs. Ars Comb., 92, 353-376 (2009)] show that K(p - k,p - i,p) for i = 0, 1 are chromatically unique if p ≥ k + 2 ≥ 4. In this paper, we show that if 2 〈 i 〈 4, the complete tripartite graph K(p - k,p - i,p) is chromatically unique for integers k ≥ i and p 〉 k2/4 + i + 1.

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