Linear and cyclic distance-three labellings of trees

Deborah King, Kelvin Yang Li, Sanming Zhou

Given a finite or infinite graph $G$ and positive integers $\ell ,h_1,h_2,h_3$, an $L(h_1,h_2,h_3)$-labelling of $G$ with span $\ell$ is a mapping $f: V(G) \rightarrow \{0, 1,…