\begin{definition}[Definition:Distinct/Plural/Pairwise Distinct]
A set $S$ of objects is '''pairwise distinct''' {{iff}}:
:for each pair $\set {x, y} \subseteq S$ of elements of $S$, $x$ and $y$ are distinct.
Category:Definitions/Set Theory
Category:Definitions/Distinct
\end{definition}