## ::Subset

### ::concepts

**Subset**::''a'' ''B''::proper ''S''::''x'' Number::equal Which::order Element::''y''

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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 partial order on sets.

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

**Subset sections**

Intro Definitions \u2282 and \u2283 symbols Examples Other properties of inclusion See also References External links

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