DW Cranston - European Journal of Combinatorics, 2022 - Elsevier
… ′ is to recolor a vertex in N ( v ) with c 1 , we recolor v with a … σ is to recolor a vertex in
N ( v ) with c s + 1 , we recolor v with … Continuing in this way, we extend σ ′ to an L -recoloring …