摘要
设U (n)是具有n个顶点的所有单圈图的集合,G(3; n- 3)是由一个三角形C3粘上一条悬挂路P_(n-3)得到的单圈图.本文将证明当n 5时具有最大度距离的单圈图是G(3; n - 3).
Let u(n) be the set of all unicyclic graphs on n(n≥3) vertices. Let G(3 ; n-3) be the graph obtained from a triangle Cs by attaching a pendent path Pn-3. In this paper we prove that the extremal graph with maximum degree distance of unicyclic graphs is G(3; n-3) when n≥5.
出处
《数学研究》
CSCD
2006年第1期18-24,共7页
Journal of Mathematical Study
基金
The work was supported by the Natural National Science Foundation of China(10371019)
SDFFZU 2003-XQ-22)
关键词
单圈图
度距离
unicyclic graph
degree distance