Union vertex-distinguishing edge colorings

Abstract: The union vertex-distinguishing chromatic index $\chi'\cup(G)$ of a graph $G$ is the smallest natural number $k$ such that the edges of $G$ can be assigned nonempty subsets of $[k]$ so that the union of the subsets assigned to the edges incident to each vertex is different. We prove that $\chi'\cup(G) \in \left{ \left\lceil \log_2\left(n +1\right) \right\rceil, \left\lceil \log_2\left(n +1\right) \right\rceil+1 \right}$ for a graph $G$ on $n$ vertices without a component of order at most two. This answers a question posed by Bousquet, Dailly, Duch^{e}ne, Kheddouci and Parreau, and independently by Chartrand, Hallas and Zhang.