The rational torsion subgroups of Drinfeld modular Jacobians and Eisenstein pseudo-harmonic cochains

Mihran Papikian, Fu-Tsun Wei

Let $\mathfrak{n}$ be a square-free ideal of ${\mathbb{F}}_q[T]$. We study the rational torsion subgroup of the Jacobian variety $J_0(\mathfrak{n})$ of the Drinfeld modular curve $X_0(\frak{…