= Elliptic function
{wiki}
An elliptic function is a <meromorphic function> with two real-linearly independent <periods> $\omega_1,\omega_2$. A <fundamental parallelogram of a period lattice>[fundamental cell] is a half-open parallelogram
$$
z_0+\{s\omega_1+t\omega_2:0\leq s,t<1\}.
$$
Opposite boundary integrals cancel. Consequently a nonconstant elliptic function has equally many zeros and poles in a cell, counted with multiplicity, and the sum of its pole residues in a cell is zero.
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