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(a,∞)-compact

Last-modified: 2015-11-17 (火) 18:09:59

Name Edit

[a,∞]-compact

Definition Edit

a is a infinite cardinal.
A topological space X is called [a,∞]-compact if every open cover of X has a subcover with cardinality strictly less than a.

Reference Edit

K.P.Hart, J. Nagata and J.E. Vaughan, Encyclopedia of general topology, Elsevier Science