Bianchi Modular Forms over Imaginary Quadratic Fields with arbitrary class group

John Cremona, Kalani Thalagoda, Dan Yasaki

Let $K$ be an imaginary quadratic field and let ${\mathcal{O}}_K$ be its ring of integers. For an integral ideal $\mathfrak{n}$ of ${\mathcal{O}}_K$, let ${\Gamma }_0(\mathfrak{n})$ be the c…