On isomorphisms of tetravalent Cayley graphs over generalized quaternion groups
Let $G$ be a finite group and $S$ be a subset of $G$ with $1\not\in S$. $S$ is called a $CI$-subset of $G$ if for any $T\subset G$, whenever $Cay (G,S)\cong Cay (G,T)$, there is an element $σ\in Aut(G)$ such that $S^σ=T$. For a positive integer $m$, $G$ is called an $m$-$CI$-group if all subsets $S$ of $G \setminus \{1\}$ with $|S|\leq m$ and $S^{-1}=S$ are $CI$-subsets. In this paper, we show that the generalized quaternion group of order $4n$ is a $4$-$CI$-group if and only if $n$ is odd.
math.GR↗