The fractional $k$-metric dimension of graphs

Cong X. Kang, Ismael G. Yero, Eunjeong Yi

Let $G$ be a graph with vertex set $V(G)$. For any two distinct vertices $x$ and $y$ of $G$, let $R\{x,y\}$ denote the set of vertices $z$ such that the distance from $x$ to $z$ i…