The Second Hyper-Zagreb Coindex of Chemical Graphs and Some Applications

Abstract

The second hyper?Zagreb coindex is an efficient topological index that enables us to describe a molecule from its molecular graph. In this current study, we shall evaluate the second hyper?Zagreb coindex of some chemical graphs. In this study, we compute the value of the second hyper?Zagreb coindex of some chemical graph structures such as sildenafil, aspirin, and nicotine. We also present explicit formulas of the second hyper?Zagreb coindex of any graph that results from some interesting graphical operations such as tensor product, Cartesian product, composition, and strong product, and apply them on a q?multiwalled nanotorus.