Absolute Complement

The complement \(A^\complement\) of a set \(A\) is the set of all things that are not in \(A\). Put simply, the complement is its opposite.

Where \(U\) denotes the universe, \(A^\complement = U \setminus A\). That is, \(A^\complement\) is the Relative complement of \(U\) and \(A\).