The vertex visibility number of graphs

Dhanya Roy, Gabriele Di Stefano, Sandi Klavžar +1

If $x\in V(G)$, then $S\subseteq V(G)\setminus \{x\}$ is an $x$-visibility set if for any $y\in S$ there exists a shortest $x,y$-path avoiding $S$. The $x$-visibility number $v_x(G)…