The PI and Edge Szeged Indices of One-Heptagonal Carbon Nanocones

The Padmakar-Ivan (PI) index of a graph G is defined as PI(G) = Sigma[m(u)(e)+ m(v)(e)], where m(u)(e) is the number of edges of G lying closer to u than to v, m(v)(e) is the number of edges of G lying closer to v than to u and summation goes over all edges of G. The edge Szeged index is a new molecular structure descriptor equal to the sum of products m(u)(e)m(v)(e) over all edges e = uv of the molecular graph G. In this paper, the PI and edge Szeged indices of one-heptagonal carbon nanocone CNC7[n] computed for the first time.