Definition:Jordan Curve/Interior

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Let $f: \left[{0 \,.\,.\, 1}\right] \to \R^2$ be a Jordan curve.

It follows from the Jordan Curve Theorem that $\R^2 \setminus \operatorname{Im} \left({f}\right)$ is a union of two disjoint connected components, one of which is bounded.

This bounded component is called the interior of $f$, and is denoted as $\operatorname{Int} \left({f}\right)$.