Further results on outer independent $2$-rainbow dominating functions of graphs

Babak Samadi, Nasrin Soltankhah

Let $G=(V(G),E(G))$ be a graph. A function $f:V(G)\to \mathbb{P}(\{1,2\})$ is a $2$-rainbow dominating function if for every vertex $v$ with $f(v)=\varnothing$, $f\big{(}N(v)…