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*n]* - a set whose members are members of another set

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http://www.webdictionary.co.uk/definition.php?query=subset

A subset of a given set is a collection of things that belong to the original set. Every element of the subset must belong to the original set, but not every element of the original set need be in a subset (otherwise, a subset would always be identical to the set it came from).

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http://www.diracdelta.co.uk/science/source/s/u/subset/source.html

*noun* a set whose members are members of another set; a set contained within another set

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http://wordnetweb.princeton.edu/perl/webwn?s=subset

(from the article `set theory`) As stated previously, a set is included in, or is a subset of, a set (symbolized by ) if every element of is an element of . So defined, a ...

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http://www.britannica.com/eb/a-z/s/178

In mathematics, especially in set theory, a set A is a subset of a set B, or equivalently B is a superset of A, if A is "contained" inside B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment. ==The symbols ⊂ and ⊃== Some authors use the symbols ⊂ and ⊃ to indicate "...

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http://en.wikipedia.org/wiki/Subset

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