大理大学学报 ›› 2021, Vol. 6 ›› Issue (12): 1-4.

• 数学与计算机科学 •    下一篇

香蕉树的Hosoya指标和Merrifield-Simmons指标的显式公式

  

  1. 大理大学数学与计算机学院,云南大理 671003
  • 收稿日期:2021-04-27 出版日期:2021-12-15 发布日期:2022-01-12
  • 作者简介:杨利民,教授,博士,主要从事图论、组合数学和计算分子生物学研究。
  • 基金资助:
    大理大学高层次人才科研启动费项目(KY0719203410)

Explicit Formulas of Hosoya Index and Merrifield-Simmons Index of Banana Trees

  1. College of Mathematics and Computer, Dali University, Dali, Yunnan 671003, China
  • Received:2021-04-27 Online:2021-12-15 Published:2022-01-12

摘要: Hosoya指标和Merrifield-Simmons指标是化学图论中两个重要的拓扑参数。设G1,G2,…,Gn是一族互不相交的星形图,通过加入一个新的顶点,并把它连接到每一个星形图Gi的一个悬挂顶点上,那么所得到的树叫做香蕉树。通过图的分支分析法,得到香蕉树的S(n )-因子计数公式,进一步导出香蕉树的Hosoya指标的显式公式。最后,采用同样的思想,香蕉树的Merrifield-Simmons指标的显式公式被呈现。

关键词: 香蕉树, S (n )-因子, Hosoya指标, Merrifield-Simmons指标

Abstract:

Hosoya index and Merrifield-Simmons index are two important topological parameters in chemical graph theory. Let G1 G2 ...Gn be a family of disjoint stars the tree obtained by joining a new vertex to one pendant vertex of each star Gi is called a banana tree. In this paper by analyzing components in graph theory the number of all Sn -factors of any banana tree is derived further explicit formula of Hosoya index of a banana tree is gained. Finally in a similar vein explicit formula of Merrifield-Simmons index of a banana tree is presented.

Key words: banana tree, S (n )-factor, Hosoya index, Merrifield-Simmons index

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