Let $D \subseteq \mathbb{C}$ be an D4995: Open complex disc such that

(i)	$f : D \to \mathbb{C}$ is a D1392: Holomorphic function on $D$
(ii)	$\gamma \subseteq C$ is an D5023: Oriented complex curve
(iii)	$\gamma$ is a D5646: Closed complex curve

Then \begin{equation} \int_{\gamma} f(z) \, d z = 0 \end{equation}