## SUBSET

### 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.

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### subset

#### Noun

1. With respect to another set, a set such that each of its elements is also an element of the other set.
The set of integers is a subset of the set of reals.
The set {a, b} is a both a subset and a proper subset of {a, b, c} while the set {a, b, c} is a subset of {a, b, c} but not a proper subset of {a, b, c}.
2. A group of things or people, all of which are in a specified larger group.
We asked a subset of the population of the town for their opinion.

The above text is a snippet from Wiktionary: subset
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