countably compact set
countably compact set
[′kau̇nt·ə·blē ‚käm‚pakt ′set] (mathematics)
A set with the property that every cover with countably many open sets contains a finite number of sets which is also a cover.
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On the other hand a topological space X is angelic if relatively countably compact sets in X are relatively compact and for every relatively compact subset A of X each point of [bar.
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