Connectivity Indices of Pent-Heptagonal Nanotube

Mohammad Reza Farahani

Abstract


Among topological descriptors connectivity indices are very important and they have a prominent role in chemistry. Let G be a simple connected graph and e=uv be an edge bond of G in chemical graph theory. There are many connectivity indices for a connected graph G. The Randi in 2008 that is equal to where du and dv are the degrees of the vertices u and v, respectively. In this paper we compute these connectivity topological indices for a family of molecular graphs that called "Pent-Heptagonal Nanotube VAC5C7(S)".

ć Connectivity Index is oldest of them, where introduced by M. Randić in 1975. Recently the Sum-Connectivity Index of G introduced by B. Zhou and N. Trinajstić

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