Distance two labeling of direct product of paths and cycles

Deborah O. A. Ajayi, Tayo C. Adefokun

Suppose that $[n]=\left\{0,1,2,...,n\right\}$ is a set of non-negative integers and $h,k\in [n]$. The $L(h,k)$-labeling of graph $G$ is the function $l:V(G)\to [n]$ such th…