test/phase5/exact-relation-expression.tex


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\begin{signature}\label{pair}
    $(a,b)$ is a set.
\end{signature}

\begin{proposition}\label{exact_relation_expression}
    Suppose $(a,b)\in R$.
    Then $a\mathrel{R}b$.
\end{proposition}
\begin{proof}
    Follows by assumption.
\end{proof}