some observations on sombor coindex of graphs

Let $g=(v,e)$, $v=left{ v_{1},v_{2},ldots ,v_{n}right}$, be a simple graph of order $n$ and size $m$, without isolated vertices. the sombor coindex of a graph $g$ is defined as  $overline{so}(g)=sum_{insim j}sqrt{d_i^2+d_j^2}$ , where $d_i= d(v_i)$ is a degree of vertex $v_i$, $i=1,2,ldots , n$. in this paper we investigate a relationship  between  sombor coindex and a number of other topological coindices.