Generalized Quaternion Rings over $\mathbb{Z}/n\mathbb{Z}$ for an odd $n$

Abstract

We consider a generalization of the quaternion ring $\left(\frac{a,b}{R}\right)$ over a commutative unital ring $R$ that includes the case when $a$ and $b$ are not units of $R$. In this paper, we focus on the case $R=\mathbb{Z}/n\mathbb{Z}$ for and odd $n$. In particular, for every odd integer $n$ we compute the number of non-isomorphic generalized quaternion rings $\left(\frac{a,b}{\mathbb{Z}/n\mathbb{Z}}\right)$