فهرست نشریات علمی دسترسی آزاد ایران

In [13] Gutman introduced a novel graph invariant called Sombor index SO, defined via $\sqrt{\deg(u)^{2}+\deg(v)^{2}}.$ In this paper we provide relations between Sombor index and some degree-based topological indices: Zagreb indices, Forgotten index and Randi\' {c} index. Similar relations are established in the class of triangle-free graphs.