详细信息
关于图与其补图谱半径之和的又一上界
Another Upper Bounds on Sum of the Spectral Radius of a Graph and Its Complement
文献类型:期刊文献
中文题名:关于图与其补图谱半径之和的又一上界
英文题名:Another Upper Bounds on Sum of the Spectral Radius of a Graph and Its Complement
作者:施劲松[1]
机构:[1]华东理工大学数学系,上海200237
年份:2004
卷号:30
期号:2
起止页码:216
中文期刊名:华东理工大学学报(自然科学版)
外文期刊名:Journal of East China University of Science and Technology
收录:CSTPCD;;Scopus;北大核心:【北大核心2000】;CSCD:【CSCD2011_2012】;
语种:中文
中文关键词:补图;谱半径;色数
外文关键词:complement graph; spectral radius; chromatic number
摘要:给出了图与其补图谱半径之和ρ(G)+ρ(Gc)的新上界,对任一顶点数为n,边数为m的简单图G,若其色数为k,则有ρ(G)+ρ(Gc)≤2n(n-1)-2m/k+2m/k1/2,其中k,m=12n(n-1)-m分别表示Gc的色数、边数。从而改进了已有的结果。
In this paper, the new upper bounds on sum of the spectral radius of graph and its complement are given. For any simple graph G with n vertices, m edges and chromatic number k, we have (ρ(G)+)ρ(G^c)≤2n(n-1)-2m/k+2/^(1/2), where and =12n(n-1)-m denote the chromatic number and edge number of G^c respectively. And this conclusion is better than the existing results.
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