Definition 5.16.2 (Relatively Compact).label Let $X$ be a topological space and $A \subset X$, then $A$ is relatively compact if $\ol A$ is compact.
Definition 5.16.2 (Relatively Compact).label Let $X$ be a topological space and $A \subset X$, then $A$ is relatively compact if $\ol A$ is compact.
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