Complement (set theory)
Set of the elements not in a given subset / From Wikipedia, the free encyclopedia
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In set theory, the complement of a set A, often denoted by A∁ (or A′), is the set of elements not in A.
When all sets in the universe, i.e. all sets under consideration, are considered to be members of a given set U, the absolute complement of A is the set of elements in U that are not in A.
The relative complement of A with respect to a set B, also termed the set difference of B and A, written is the set of elements in B that are not in A.