< Diedersingularität < BD1 < Zu Z mod 4
Zeige explizit, dass der Ring (also die Diedersingularität zu ) isomorph
zu ist.![{\displaystyle {}\mathbb {C} [X,Y,Z]/{\left(X^{2}+YZ^{2}+Y^{2}\right)}}](../../../../I/713781050373c1868225f4039edba9e71ecd171a.svg)
![{\displaystyle {}\mathbb {C} [S,T,U]/{\left(ST-U^{4}\right)}}](../../../../I/af639ac6e3754267eefff9d746fe8213fdf15c8c.svg)
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