On evdegree and vedegree topological indices

Recently two new degree concepts have been defined in graph theory: evdegree and vedegree. Also the evdegree and vedegree Zagreb and Randić indices have been defined very recently as parallel of the classical definitions of Zagreb and Randić indices. It was shown that evdegree and vedegree topological indices can be used as possible tools in QSPR researches . In this paper we define the vedegree and evdegree 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 evdegree and vedegree NarumiKatayama and Zagreb indices.