MINIMAL DOUBLY RESOLVING SET FOR THECORONA PRODUCT OF Cn ◦ Km

Let $G$ be a simple connected undirected graph of order at least two. A subset $W= {w_1, ..., w_l}$ of vertices of $G$ is a doubly resolving set of $G$ if every two distinct vertices of $G$ are doubly resolved by some two vertices of $W$. The cardinality of a minimal doubly resolving set is denoted by $psi(G)$. In this paper, we consider the problem of determining the cardinality $psi(C_ncirc K_m)$ of a minimal doubly resolving set for the corona product of $C_n circ K_m$.