Independent Double Roman Domination on Block Graphs

Decheng Wei, Changhong Lu

Given a graph $G=(V,E)$, $f:V\to \{0,1,2\}$ is the Italian dominating function of $G$ if $f$ satisfies ${\sum }_{u\in N(v)}f(u)\ge 2$ when $f(v)=0$. Denote $w(f)=\sum_{v…