University of Kashan Iranian Journal of Mathematical Chemistry 2228-6489 12 1 2021 03 01 Relations between Sombor Index and some Degree-Based Topological Indices 19 26 111293 10.22052/ijmc.2021.240385.1533 EN Slobodan Filipovski Famnit, University of Primorska, Glagoljaška 8 Koper, Slovenia Journal Article 2020 12 02 In [13] Gutman introduced a novel graph invariant called Sombor index SO, defined via $\sqrt{\deg(u)^{2}+\deg(v)^{2}}.$<br /> In this paper we provide relations between Sombor index and some degree-based topological indices: Zagreb indices, Forgotten index and Randi\' {c} index.<br /> Similar relations are established in the class of triangle-free graphs. https://ijmc.kashanu.ac.ir/article_111293_bf5cb60a117841d4c269a41e141bb72b.pdf