Hecke equivariance of generalized Borcherds products of type $O(2,1)$

Daeyeol Jeon, Soon-Yi Kang, Chang Heon Kim

Recently, a weak converse theorem for Borcherds' lifting operator of type $O(2,1)$ for $\G_0(N)$ is proved and the logarithmic derivative of a modular form for $\G_0(N)$ is explici…