Edge-Szeged and vertex-PIindices of Some Benzenoid Systems

The edge version of Szeged index and vertex version ofPIindex are defined very recently. They are similar to edge-PI and vertex-Szeged indices, respectively. The different versions of Szeged and PIindices are the most important topological indices defined in Chemistry. In this paper, we compute the edge-Szeged and vertex-PIindices of some important classes of benzenoid systems.