title: Chain hexagonal cacti with the extremal eccentric distance sum.
abstract: Eccentric distance sum (EDS), which can predict biological and physical properties, is a topological index based on the eccentricity of a graph. In this paper we characterize the chain hexagonal cactus with the minimal and the maximal eccentric distance sum among all chain hexagonal cacti of length n, respectively. Moreover, we present exact formulas for EDS of two types of hexagonal cacti.
authors.affiliation: School of Mathematics, Shandong Institute of Business and Technology, 191 Binhaizhong Road, Yantai, Shandong 264005, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Qu
authors.affiliation: School of Mathematics, Shandong Institute of Business and Technology, 191 Binhaizhong Road, Yantai, Shandong 264005, China.
authors.forename: Guihai
authors.identifier: 0000-0003-2778-1989
authors.initials: G
authors.lastname: Yu