Definition:Open Region/Complex
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Definition
Let $D \subseteq \C$ be a subset of the set of complex numbers.
$D$ is an open region if and only if $D$ is:
- $(1): \quad$ An open set
and
- $(2): \quad$ connected.
Also known as
An open region is also known as a domain.
Sources
- 1981: Murray R. Spiegel: Theory and Problems of Complex Variables (SI ed.) ... (previous) ... (next): $1$: Complex Numbers: Point Sets: $8.$