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Answer by GH from MO for How does this definition define a größencharakter?
$\psi_N$ is a Größencharakter modulo $\mathfrak{m}:=\mathcal{O}_K$ in the following way. Let $\chi_f$ be the trivial character on the $1$-element group $(\mathcal{O}_K/\mathfrak{m})^\times$, and let...
View ArticleHow does this definition define a größencharakter?
In Elliptic Modular Forms and Their Applications, p.89, Zagier defines a "größencharakter" $\psi_N$ on the field $K = \mathbb{Q}(i)$. This is a character on ideals. Since $\mathcal{O}_K =...
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