Eta Products and Models for Modular Curves
Eta Products and Models for Modular Curves
Eta Products and Models for Modular Curves
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Lemma: (C ∗ p/q d , 〈ζq〉) ∼ (C ∗ p/q d 1 , 〈ζq 1〉) if <strong>and</strong> only if<br />
q gcd(d,N/d) = q gcd(d,N/d)<br />
1<br />
.