Extremal incomplete sets in finite abelian groups

Dan Guo, Yongke Qu, Guoqing Wang +1

Let $G$ be a finite abelian group. The critical number $\mathrm{cr}(G)$ of $G$ is the least positive integer $\ell$ such that every subset $A\subseteq G\setminus \{0\}$ of cardinality…