摘要
设G是一个阶数大于等于4的简单连通图.K_4(G)和d_4(G)分别表示G的第四大无符号拉普拉斯特征值和第四大度.本文证明了k_4(G)≥d_4(G)—2.
Let G be a simple connected graph with order n ≥ 4. Denote by K4(G) and d4(G) the forth largest sign[ess Laplacian eigenvalue and the forth largest degree of G, respectively. This note shows that K4(G) ≥d4(G) - 2.
出处
《数学研究》
CSCD
2012年第1期9-15,共7页
Journal of Mathematical Study
基金
supported by NSFC(10971198,11126258)
the Natural Science Foundation of Zhejiang Province(26090150)
the Scientific Research Fund of Zhejiang Provincial Education Department(Y201120835)
关键词
无符号拉普拉斯特征值
下界
度
Signless Laplacian Eigenvalue
Lower bound
Degree