The set containing
the members that are in any of the given sets,
\begin{equation*}
S_1 \cup \cdots \cup S_n
:= \big\{ s \mid (s \in S_1) \lor \cdots \lor (s \in S_n) \big\},
\end{equation*}
where
- \(n\) is the number of operands
- \(S_i\) is the \(i\)-th operand.