Table 1.

Formulation of degree-based molecular descriptors

$D(\Gamma )$	$f({\omega }_{\Gamma }(x),{\omega }_{\Gamma }(y))$	$D(\Gamma )$	$f({\omega }_{\Gamma }(x),{\omega }_{\Gamma }(y))$
First Zagreb index ($M_1(\Gamma )$)[16]	${\omega }_{\Gamma }(x)+{\omega }_{\Gamma }(y)$	Second Zagreb index ($M_2^{\ast }(\Gamma )$)[16]	${\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)$
Randić index ($R(\Gamma )$)[55]	$\frac{1}{\sqrt{{\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)}}$	Forgotten topological index ($F(\Gamma )$)[13]	${\omega }_{\Gamma }{(x)}^2+{\omega }_{\Gamma }{(y)}^2$
Inverse sum indeg index ($ISI(\Gamma )$) [64]	$\frac{{\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)}{{\omega }_{\Gamma }(x)+{\omega }_{\Gamma }(y)}$	Sum connectivity index ($SCI(\Gamma )$)[70]	$\frac{1}{\sqrt{{\omega }_{\Gamma }(x)+{\omega }_{\Gamma }(y)}}$
Inverse Randić index ($RR(\Gamma )$) [17]	$\sqrt{{\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)}$	Redefined third Zagreb index ($ReZ{G}_3(\Gamma )$) [56]	${\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)({\omega }_{\Gamma }(x)+{\omega }_{\Gamma }(y))$
Augmented Zagreb index ($AZI(\Gamma )$)[21]	${(\frac{{\omega }_{\Gamma }(x){\omega }_{\Gamma }(y)}{{\omega }_{\Gamma }(x)+{\omega }_{\Gamma }(y)})}^3$	Symmetric division degree index ($SDD(\Gamma )$) [64]	$\frac{{\omega }_{\Gamma }(x)}{{\omega }_{\Gamma }(y)}+\frac{{\omega }_{\Gamma }(y)}{{\omega }_{\Gamma }(x)}$