On the connective eccentricity index of two types of trees

Zikai Tang, Lingyao Jiang, Hanyuan Deng

The connective eccentricity index ${\xi }^{ce}={\sum }_{u\in V}^{}\frac{d(u)}{\epsilon (u)}$, where $\epsilon (u)$ and $d(u)$ denote the eccentricity and the degree of the vertex $u$,…