\begin{definition}[Definition:Equivalence Class/Representative]
Let $S$ be a set.
Let $\RR \subseteq S \times S$ be an equivalence relation on $S$.
Let $x \in S$.
Let $\eqclass x \RR$ be the equivalence class of $x$ under $\RR$.
Let $y \in \eqclass x \RR$.
Then $y$ is a '''representative of $\eqclass x \RR$.
\end{definition}