详细信息
给定独立数的双圈图的最大拟拉普拉斯谱半径(英文)
Maximal signless Laplacian spectral radius of bicyclic graphs with given independence number
文献类型:期刊文献
中文题名:给定独立数的双圈图的最大拟拉普拉斯谱半径(英文)
英文题名:Maximal signless Laplacian spectral radius of bicyclic graphs with given independence number
作者:李瑞林[1];施劲松[1];董炳灿[1]
机构:[1]华东理工大学数学系,上海200237
年份:2011
期号:3
起止页码:73
中文期刊名:华东师范大学学报(自然科学版)
外文期刊名:Journal of East China Normal University(Natural Science)
收录:CSTPCD;;北大核心:【北大核心2008】;CSCD:【CSCD2011_2012】;
基金:国家自然科学基金(10771069)
语种:中文
中文关键词:拟拉普拉斯谱半径;双圈图;独立数
外文关键词:signless Laplacian spectral radius; bicyclic graph; independence number
摘要:设B(n,α)是独立数为α的n阶双圈图,B_1(n,α)是由B(n,α)中含有两个边不交的圈构成的双圈图子集,B_2(n,α)=B(n,α)\B_1(n,α).文中分别研究了B_1(n,α)和B_2(n,α)中具有最大拟拉普拉斯谱半径的极图.进一步地,得到了B(n,α)中拟拉普拉斯谱半径的上界,并给出达到上界的极图.
Let B(n,α)be the class of bicyclic graphs on n vertices with independence numberα.Let B_1(n,α)be the subclass of B(n,α)consisting of all bicyclic graphs with two edge-disjoint cycles and B_2(n,α)=B(n,α)/B_1(n,α).This paper determined the unique graph with the maximal signless Laplacian spectral radius among all graphs in B_1(n,α) and B_2(n,α),respectively.Furthermore,the upper bound of the signless Laplacian spectral radius and the extremal graph for B(n,α)were also obtained.
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