Question

What is complements of a set?

Answer 1

When the all 'sets' under consideration are considered to be subsets of a given set U, the absolute 'complement' of A is the 'set' of elements in U but not in A. The relative complement of A with respect to a set B, also termed the difference of sets A and B, written B A, is the set of elements in B but not in A.

Answer 2

When all sets under consideration are considered to be subsets of a given set u, the absolutely complement of A is the set elements of U but not in A.