NEIGHBORHOOD NIRMALA INDEX AND IT’S EXPONENTIAL OF NANOCONES AND DENDRIMERS

Recently, a novel invariant is considered, which is the Nirmala index defined as the sum of the square root of sum of the degrees of the pairs of adjacent vertices. In this paper, we introduce some new Nirmala indices: the second, third, fourth and neighborhood (or fifth) Nirmala indices of a graph. Furthermore, we compute the neighborhood Nirmala index and its exponential for certain important chemical structures such as nanocones and dendrimers.