Definition 5.27.1 (Extremely Disconnected).label Let $X$ be a topological space, then $X$ is extremely disconnected if for every $U \subset X$ open, $\ol U$ is also open.
Definition 5.27.1 (Extremely Disconnected).label Let $X$ be a topological space, then $X$ is extremely disconnected if for every $U \subset X$ open, $\ol U$ is also open.
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