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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for closed set

closed set

noun (maths)
a set that includes all the values obtained by application of a given operation to its members
(in topological space) a set that contains all its own limit points
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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closed set in Technology

A set S is closed under an operator * if x*y is in S for all x, y in S.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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