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lemma for imaginary quadratic fields

Type of Math Object: 
Theorem
Major Section: 
Reference
Groups audience: 

Mathematics Subject Classification

11R11 no label found11R04 no label found

Comments

does d have to be squarefree in this lemma?

V\"ais\"al\"a's proof is quite long, and partly rests on former theorems where one usually supposes the squarefreeness. Of course, one never needs to think that when speaking of quadratic field Q(\sqrt{d}), d were other than square-free.
Regards,
Jussi

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