Periodic function
From specialfunctionswiki
A function $f \colon X \rightarrow \mathbb{C}$ is called periodic with period $\omega$ if $f(z+\omega)=f(z)$ whenever both $z,z+\omega \in X$.
A function $f \colon X \rightarrow \mathbb{C}$ is called periodic with period $\omega$ if $f(z+\omega)=f(z)$ whenever both $z,z+\omega \in X$.
