Definition:Interior of Simple Closed Contour
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Definition
Let $C$ be a simple closed contour in the complex plane.
Let $f : \closedint 0 1 \to \R^2$ be a Jordan curve.
Let $\phi : \R^2 \to \C$ be defined by:
- $\map \phi {x, y} = x + i y$
Let $\Img C = \map \phi {\Img f}$, where $\Img C$ denotes the image of $C$, and $\Img f$ denotes the image of $f$.
Then the interior of $C$ is denoted $\Int C$ and defined as:
- $\Int C = \map \phi {\Int f}$
where $\Int f$ denotes the interior of $f$.
Also see
- Interior of Simple Closed Contour is Well-Defined
- Complex Plane is Homeomorphic to Real Plane, which shows that $\phi$ is a homeomorphism between $\R^2$ and $\C$.
Sources
- 2001: Christian Berg: Kompleks funktionsteori: $\S 2.2$