Finde in den Koordinatenringen zu den D {\displaystyle {}D} -Singularitäten, also in K [ X , Y , Z ] / ( X 2 + Y Z 2 + Y m + 1 ) {\displaystyle {}K[X,Y,Z]/{\left(X^{2}+YZ^{2}+Y^{m+1}\right)}} zu m ≥ 2 {\displaystyle {}m\geq 2} , Elemente, die irreduzibel, aber nicht prim sind.
![{\displaystyle {}K[X,Y,Z]/{\left(X^{2}+YZ^{2}+Y^{m+1}\right)}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/a9326f991c1d873e4fcb99edd3c8d4a96d332780)
