On the minimal eccentric connectivity indices of bipartite graphs with some given parameters

On the minimal eccentric connectivity indices of bipartite graphs with some given parameters
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关于给定参数二分图的最小偏心连通指数

DOI:
10.1016/j.dam.2018.11.011
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发表时间:
2019-04
影响因子:
1.1
通讯作者:
Wang Guangfu
Wang Guangfu
中科院分区:
数学3区
文献类型:
--
作者:
Zhang Minjie;Li Shuchao;Xu Baogen;Wang Guangfu

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设G是连通图。G的偏心连通性指数ξc(G)定义为ξc(G)=∑v∈V G d G(V)ϵG(V),其中偏心度ϵG(V)=max u∈V G d G(v,u)。Zhang等人(2012)研究了图的最小偏心连通度指数。作为它的继续,本文考虑了二部图上的这些问题。利用给定直径的n点连通二部图的边数,得到了ξc(G)的下界。在所有m条边、直径至少为S的n点连通二部图和直径至少为S的n点连通二部图中,分别建立了ξc(G)的下界。所有相应的极图都被识别出来了。
Let G be a connected graph. The eccentric connectivity index ξ c (G) of G is defined as ξ c (G)=∑ v∈ V G d G (v) ϵ G (v), where the eccentricity ϵ G (v)= max u∈ V G d G (v, u). Zhang et al.(2012) studied the minimal eccentric connectivity indices of graphs. As a continuance of it, in this paper we consider these problems on bipartite graphs. We obtain lower bounds on ξ c (G) in terms of the number of edges among n-vertex connected bipartite graphs with given diameter. Among all connected bipartite graphs on n vertices with m edges and diameter at least s, and connected bipartite graphs on n vertices with diameter at least s, we establish the lower bounds on ξ c (G), respectively. All the corresponding extremal graphs are identified.
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发表时间: 2010-06
影响因子: 1
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