Combination Theorem for Continuous Functions/Sum Rule

Theorem

Real Functions

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

$f + g$ is ‎continuous on $S$.


Complex Functions

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

$f + g$ is ‎continuous on $S$.


Sources

  • 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): continuous function (continuous mapping)
  • 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): continuous function (continuous mapping, continuous map)
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