$D$-elliptic modular curves $X_0(N)$

Maarten Derickx, Daeyeol Jeon, Yongjae Kwon +1

We present a method for determining whether there exists a degree $D$ rational map from $X_0(N)$ to some elliptic curve $E/\mathbb{Q}$. Moreover, we explain how to obtain a quadrat…