# Closed

Let $(X,\tau)$ be a topological space. We say that $K \subset X$ is a closed set if its complement $X \setminus K \in \tau$, i.e. that $X \setminus K$ is an open set.

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Let $(X,\tau)$ be a topological space. We say that $K \subset X$ is a closed set if its complement $X \setminus K \in \tau$, i.e. that $X \setminus K$ is an open set.

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- This page was last edited on 24 December 2018, at 01:44.