Lecture Notes on Bayesian Estimation and Classification
《Lecture Notes on Bayesian Estimation and Classification》 · 第 140-141 页 · Section 5.3「Groups of Prime-Power Order」，小节「Quaternion Groups」
An important type of finite 2-group that occurs in many investigations is the generalized quaternion group $Q_{2^n}$, $(n\ge 3)$; this is a group with a presentation of the form $\langle x,y\mid x^{2^{n-1}}=1,\ y^2=x^{2^{n-2}},\ y^{-1}xy=x^{-1}\rangle$.