subset(redirected from Inclusion (set theory))
Also found in: Thesaurus, Encyclopedia.
A set contained within a set.
1. (Mathematics) maths
a. a set the members of which are all members of some given class: A is a subset of B is usually written A⊆B
b. proper subset one that is strictly contained within a larger class and excludes some of its members. Symbol: A⊂B
2. a set within a larger set
1. a set that is a part of a larger set.
2. Math. a set consisting of elements of a given set that can be the same as the given set or smaller.
A set whose members are all contained in another set. The set of positive integers, for example, is a subset of the set of integers.