Combination Theorem for Continuous Functions/Complex

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Theorem

Let $\C$ denote the complex numbers.

Let $f$ and $g$ be complex functions which are continuous on an open subset $S \subseteq \C$.

Let $\lambda, \mu \in \C$ be arbitrary complex numbers.


Then the following results hold:


Sum Rule

$f + g$ is ‎continuous on $S$.


Multiple Rule

$\lambda f$ is continuous on $S$.


Combined Sum Rule

$\lambda f + \mu g$ is continuous on $S$.


Product Rule

$f g$ is continuous on $S$


Quotient Rule

$\dfrac f g$ is continuous on $S \setminus \set {z \in S: \map g z = 0}$

that is, on all the points $z$ of $S$ where $\map g z \ne 0$.


Also see


Sources


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