Es sei D {\displaystyle {}D} quadratfrei und betrachte Z [ D ] ⊆ A D {\displaystyle {}\mathbb {Z} [{\sqrt {D}}]\subseteq A_{D}} . Charakterisiere für die beiden Ringe, wann D {\displaystyle {}{\sqrt {D}}} prim ist.
![{\displaystyle {}\mathbb {Z} [{\sqrt {D}}]\subseteq A_{D}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/7913dbb06d12bf46960fec8aeca4fe749b361816)
