Set with Complement forms Partition
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Theorem
Let $\O \subset S \subset \mathbb U$.
Then $S$ and its complement $\map \complement S$ form a partition of the universal set $\mathbb U$.
Proof
Follows directly from Set with Relative Complement forms Partition:
If $\O \subset T \subset S$, then $\set {T, \relcomp S T}$ is a partition of $S$.
$\blacksquare$