Open Access
Research Article·pp. 1–19·Online FirstJun 2026
The neighborhood version of the Harmonic index of trees
Hamideh Aram, Maryam Atapour, Nasrin Dehgardi
Published Online: 08 Jun 2026DOI: 10.47974/JIOS-1910
In this paper: In a graph G, the neighborhood version of the harmonic index is calculated by summing the values 2/(ΛG (x)+ΛG (y)) for all pairs of adjacent vertices x and y. Here, ΛG (x) represents the total degree...
