on ev-degree and ve-degree topological indices

Recently two new degree concepts have been defined in graph theory: ev-degree and ve-degree. also the ev-degree and ve-degree zagreb and randić indices have been defined very recently as parallel of the classical definitions of zagreb and randić indices. it was shown that ev-degree and ve-degree topological indices can be used as possible tools in qspr researches [2]. in this paper, we define the ve-degree and ev-degree narumi–katayama indices, investigate the predicting power of these novel indices and extremal graphs with respect to these novel topological indices. also we give some basic mathematical properties of ev-degree and ve-degree narumi-katayama and zagreb indices.