In Set theory, the relative complement of a set in another is the set of all elements that are not in the former set and in the later. It is a binary operation on sets that is defined as: This article is a stub, please help Philosophy Wiki by improving it. If its finished, please remove this template. Set Theory Concepts Set theory, Set, Element, Subset, Equality, Empty Set, Enumeration, Function, Ordered pair, Uncountable set, Extensionality, Finite set, Domain, Codomain, Image, DeMorgan's Laws Operations Union, Intersection, Relative complement, Absolute complement, Symmetric complement, Cartesian product, Power Set Axiomatic Systems ZF Set Theory