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+\begin{prooftree}
+\AxiomC{$A \seq A$}
+\RightLabel{\scriptsize $\lnot\ \text{R}$}
+\UnaryInfC{$\seq A, \lnot A$}
+\AxiomC{$A \seq A$}
+\RightLabel{\scriptsize $\limplies\ \text{L}$}
+\BinaryInfC{\lnot A \limplies A \seq A}
+\RightLabel{\scriptsize $\limplies\ \text{R}$}
+\UnaryInfC{$(\lnot A \limplies A) \seq A$}
+\end{prooftree}