摘要
设G是一个图,P(G,λ)是G的色多项式,用[G]p表示以P(G,λ)为其色多项式的所有图的集合,称为图G的色等价类.刻画了[Icm]p,其中Im(m 6)表示路Pm-4的两个端点分别粘接一个P3的2度点后得到的图.Gc表示G的补图.
For a graph G, let P( G, λ ) be its chromatic polynomial and [ G]p be the set of graphs having P( G, λ ) as their chromatic polynomial, it is said to be chromatically equivalent class of G. The [ I^cm ] p has been determined, where I^cm is the complement of Im, Im (m≥6) is the graph obtained by identifying each endvertex of Pm-4 with one 2-degree vertex of P3, respectively.
出处
《山东大学学报(理学版)》
CAS
CSCD
北大核心
2006年第5期33-38,43,共7页
Journal of Shandong University(Natural Science)
基金
教育部科学技术研究重点资助项目(206156)
关键词
色多项式
伴随多项式
色等价
伴随等价
chromatic polynomial
adjoint polynomial
chromatic equivalent
adjoint equivalent