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20 lines
545 B
20 lines
545 B
\begin{center}
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\begin{minipage}{0.2\textwidth}
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\begin{prooftree}
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\AxiomC{$ \varphi$}
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\RightLabel{$ \ori1$}
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\UnaryInfC{$ \varphi \lor \psi$}
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\end{prooftree}
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\end{minipage}
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\begin{minipage}{0.2\textwidth}
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\begin{prooftree}
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\AxiomC{$ \varphi$}
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\RightLabel{$ \ori2$}
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\UnaryInfC{$ \psi \lor \varphi$}
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\end{prooftree}
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\end{minipage}
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\end{center}
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If we know that $\varphi$ holds, we can derive that $\varphi \lor \psi$ holds and that
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$\psi \lor \varphi$ holds. This is true for any $\psi$.
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