A note on filled groups

Abstract

Let $G$ be a finite group and $S$ a subset of $G$. Then $S$ is {\em product-free} if $S \cap SS = \emptyset$, and $S$ {\em fills} $G$ if $G^{\ast} \subseteq S \cup SS$. A product-free set is locally maximal if it is not contained in a strictly larger product-free set. Street and Whitehead [J. Combin. Theory Ser. A \textbf{17} (1974), 219--226] defined a group $G$ as {\em filled} if every locally maximal product-free set in $G$ fills $G$. Street and Whitehead classified all abelian filled groups, and conjectured that the finite dihedral group of order $2n$ is not filled when $n=6k+1$ ($k\geq 1$). The conjecture was disproved by the current authors in [Austral. Journal of Combinatorics \textbf{63 (3)} (2015), 385--398], where we also classified the filled groups of odd order. This brief note completes the classification of filled dihedral groups and discusses filled groups of order up to 100.