Bestimme in Z [ 7 ] {\displaystyle {}\mathbb {Z} [{\sqrt {7}}]} die Primideale, die 5 − 3 7 {\displaystyle {}5-3{\sqrt {7}}} enthalten, sowie den Hauptdivisor zu 5 − 3 7 {\displaystyle {}5-3{\sqrt {7}}} .
![{\displaystyle {}\mathbb {Z} [{\sqrt {7}}]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/66be73e70b9762c9614503613d2b178dd5d5ff33)
