Definition 3.1.2 (Closed Set).label Let $(X,\tau)$ be a topological space, then $A\suf X$ is closed if $A^{c}\in\tau$. We say $A\suf X$ is clopen if $A$ is open and closed.
Definition 3.1.2 (Closed Set).label Let $(X,\tau)$ be a topological space, then $A\suf X$ is closed if $A^{c}\in\tau$. We say $A\suf X$ is clopen if $A$ is open and closed.
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