The top ten values of harmonic index in chemical trees

Abstract

Let G be an n-vertex graph with degree sequence d1, d2, …, dn. The harmonic index H(G) is defined as n/I(G)= Σ n i= 1(l/di)., In this paper the top ten values of harmonic index in the set of all chemical trees of order n are determined.

Keywords

• Harmonic index
• chemical tree