# 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 $$A$$.