摘要
设G=(V,E)是连通图.G的离心连通度指标定义为(?)~c(G)=∑_(x∈V)ec(x)deg(x),其中ec(x)是x的离心率,deg(x)是x的度.
Let G=(V,E) be a connected graph.The eccentric connectivity index of G is defined asξ~c(G) =Σ_(x∈V)ec(x)deg(x),where ec(x) is the eccentricity of X,deg(x) is the degree of x.We obtain the lower and upper bounds of unicyclic graphs with diameter.d.
出处
《数学研究》
CSCD
2010年第4期322-327,共6页
Journal of Mathematical Study
基金
supported by NSFC(No 10831001)
Natural Science Foundation of Fujian Province(2010J05005).
关键词
离心率
离心连通度指标
Eccentric connectivity index
Eccentricity