Upper and lower bounds for topological indices on unicyclic graphs Articles uri icon

publication date

  • November 2023

volume

  • 339

International Standard Serial Number (ISSN)

  • 0166-8641

Electronic International Standard Serial Number (EISSN)

  • 1879-3207

abstract

  • The aim of this paper is to obtain new inequalities for a large family of topological indices restricted to unicyclic graphs and to characterize the set of extremal unicyclic graphs with respect to them. This family includes variable first Zagreb, variable sum exdeg, multiplicative second Zagreb and Narumi-Katayama indices. Our main results provide upper and lower bounds for these topological indices on unicyclic graphs, fixing or not the maximum degree or the number of pendant vertices.

keywords

  • multiplicative second zagreb index; narumi-katayama index; unicyclic graphs; variable first zagreb index; variable sum exdeg index