subset

[n] - a set whose members are members of another set
Found on http://www.webdictionary.co.uk/definition.php?query=subset

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

subset

noun a set whose members are members of another set; a set contained within another set
Found on http://wordnetweb.princeton.edu/perl/webwn?s=subset

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

Subset

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, that is, all elements of A are also elements of B. A and B may coincide. The relationship of one set being a subset of another is called inclusion or sometimes containment. The subset relation defines a pa.....
Found on http://en.wikipedia.org/wiki/Subset
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