Subset

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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 partially ordered set.

The algebra structure of subsets forms a Boolean algebra in which the subset relation is called inclusion.

See also

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