三元素链是由若干个正三角形序列且任意相邻两个正三角形之间有一条割边构成的连通图.本文主要研究n个正三角形序列构成的三元素链T_n的Merrifield-Simmons指标和Hosoya指标,并给出其计算公式.
Three-membered chains is a connected graph that consists of several circumscribed triangle sequences and any two adjacent circumscribed triangle have only one cut edge.In this paper,the Merrifield -Simmons index and Hosoya index of the n circumscribed triangle sequences were studied,calculation formula of three-membered chains T_n was given.