On The Harmonic Index Of HAC5C6C7 [P,Q] Carbon Nanotube

Abstract

Let G = (V, E) be a molecular graph with vertex set V and edge set E. The Harmonic index of a connected graph is defined as, H(G) =   , where d_v is the degree of a connected graph G. The Harmonic polynomial of a graph G is defined as, H(G,x) = , where =H(G).

In this paper we study Harmonic index, Harmonic polynomial and M-polynomial of HAC₅C₆C₇[p,q] carbon nanotube.