一类树的σ-指标序列

Orderings of One Class of Special Tree determined by σ-Index

设n,r是正整数,路PnTpn,vk,sr,PnTPn,vk,sr.本文研究了Sr粘结在Pn的不同端点Vk上得到的图的σ-指标,给出了这些图的σ-指标序列.

For two positive integers ：n and r, let Pn∈T（pn·vk·sr） In this paper,we investigate the σ- index ofone class of special trees. We obtain the ordefings of the class of trees determined by its σ - index.