Complex Analysis/Elliptic functions

Definition (elliptic function):

An elliptic function is a function $f\in M(\mathbb {C} )$ such that there exists a lattice $L\subset \mathbb {C}$ a basis $\{w_{1},w_{2}\}$ of which satisfies

$\forall z\in \mathbb {C} :f(z+w_{1})=f(z)=f(z+w_{2})$.