User blog comment:Alemagno12/Boboris02's Modular Function/@comment-1605058-20170114184015

Fun fact: in normal mathematics, a modular function is a meromorphic function \(f:\{z\in\mathbb C:\operatorname{Re}z>0\}\rightarrow\mathbb C\) which is meromorphic at the cusp and invariant under the action of the modular group. .