Closed set
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Revision as of 04:49, 15 February 2015 by Alec (Talk | contribs) (Created page with "A closed set in a topological space <math>(X,\mathcal{J})</math> is a set <math>A</math> where <math>X-A</math> is open. {{Definition|Topology}}")
A closed set in a topological space (X,J) is a set A where X−A is open.
