Definition:Closed Region/Complex
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Definition
Let $D \subseteq \C$ be a subset of the set of complex numbers.
$D$ is a closed region if and only if $D$ the closure of an open region.
Sources
- 1981: Murray R. Spiegel: Theory and Problems of Complex Variables (SI ed.) ... (previous) ... (next): $1$: Complex Numbers: Point Sets: $10.$