Extremal Polygonal Cacti for General Sombor Index

Jiachang Ye, Jianguo Qian

The Sombor index of a graph $G$ was recently introduced by Gutman from the geometric point of view, defined as $SO(G)={\sum }_{uv\in E(G)}\sqrt{d(u{)}^2+d(v{)}^2}$, where $d(u)$ is the de…