closed set

noun Mathematics.

a set that contains all of its accumulation points, as the set of points on and within a circle; a set having an open set as its complement.

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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins

World English Dictionary

closed set

—n
1.	a set that includes all the values obtained by application of a given operation to its members
2.	(in topological space) a set that contains all its own limit points

Collins English Dictionary - Complete & Unabridged 10th Edition
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FOLDOC

Computing Dictionary

closed set definition

mathematics
A set S is closed under an operator * if x*y is in S for all x, y in S.
(1994-12-16)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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