Let \(\Omega\subset \mathbb{C}\) be an open domain. A function \(f\colon \Omega \to \mathbb{C}\) which is locally given by a convergent power series is called analytic.
Let \(\Omega\subset \mathbb{C}\) be an open domain. A function \(f\colon \Omega \to \mathbb{C}\) which is locally given by a convergent power series is called analytic.