Redefined Zagreb, Randic, harmonic and GA indices of graphene

Graph theory has provided chemist with a variety of useful tools, such as topological indices.A topological index T op(G) of a graph G is a number with the property that for every graph H isomorphic to G, T op(H) = T op(G).Graphene is one of the most promising nanomaterials because of its unique combination of superb properties,which opens away for its exploitation in a wide spectrum of applications ranging from electronics to optics, sensors, and biodevices.In this article, we present exact expressions for some topological indices of carbon compound graphene.We compute, Re-defined version of Zagreb indices, General Randic index, General version of harmonic index, Ordinary geometric-arithmetic index of Graphene.