The extremal irregularity of connected graphs with given number of pendant vertices

The extremal irregularity of connected graphs with given number of pendant vertices
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具有给定数量的下垂顶点的连通图的极值不规则性

DOI:
10.21136/cmj.2022.0125-21
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发表时间:
2022-04
影响因子:
0.5
通讯作者:
Qiuyun Zhu
Qiuyun Zhu
中科院分区:
数学4区
文献类型:
--
作者:
Xiaoqian Liu;Xiaodan Chen;Junli Hu;Qiuyun Zhu

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图G =(V,E)的不规则度定义为不平衡度之和|du − dv|其中du表示G中顶点u的度。这个图不变量是由Albertson在1997年提出的,是一个图的正则性缺陷的度量。本文完全确定了具有n个顶点和p个悬垂顶点(1 6 p 6 n − 1)的连通图的不规则性的极值,并刻画了相应的极图.
The irregularity of a graph G = (V, E) is defined as the sum of imbalances |du − dv| over all edges uv ∈ E, where du denotes the degree of the vertex u in G. This graph invariant, introduced by Albertson in 1997, is a measure of the defect of regularity of a graph. In this paper, we completely determine the extremal values of the irregularity of connected graphs with n vertices and p pendant vertices (1 6 p 6 n − 1), and characterize the corresponding extremal graphs.
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