Es sei n ∈ N + {\displaystyle {}n\in \mathbb {N} _{+}} . Zeige, dass der Restklassenring Z [ i ] / ( n ) {\displaystyle {}\mathbb {Z} [{\mathrm {i} }]/(n)} genau n 2 {\displaystyle {}n^{2}} Elemente besitzt.
![{\displaystyle {}\mathbb {Z} [{\mathrm {i} }]/(n)}](https://wikimedia.org/api/rest_v1/media/math/render/svg/d234f1513c4014cfc76a44bf9984a4101c77224c)
