# Closed set/Definition: Difference between revisions

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imported>Jitse Niesen (The complement of an open set.) |
imported>Peter Schmitt (Unfortunately, the boundary can be empty.) |
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<noinclude>{{Subpages}}</noinclude> | <noinclude>{{Subpages}}</noinclude> | ||

In geometry and topology, a set that contains all its [[boundary point]]s; the complement of an [[open set]]. |

## Revision as of 18:15, 30 September 2009

In geometry and topology, a set that contains all its boundary points; the complement of an open set.