An example of nonzero ring $R$ with $R^m\cong R^n$, $m\neq n$ Posted by yzll, at math.stackexchange.com, 15 Jul 2019 I'd like to find an example of a nonzero ring $R$ and positive integers $m,n$ with $m\neq n$ such that $R^m\cong R^n$ as $R$-modu…