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 \(A\).