# Cauchy-Riemann equations/Related Articles

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• Holomorphic function [r]: Function ${\displaystyle f}$ from ${\displaystyle A\subseteq \mathbb {C} }$ to ${\displaystyle B\subseteq \mathbb {C} }$ is called holomorphic in domain ${\displaystyle A}$ if for every open domain ${\displaystyle E\subseteq A}$ there exist derivative ${\displaystyle f'(z)~\forall ~z\in E}$. [e]