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10 lines
259 B
10 lines
259 B
\begin{logicproof}{2}
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\lnot\psi & \prem \\
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\varphi \imp \psi & \prem \\
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\begin{subproof}
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\varphi & \assum \\
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\psi & $\impe 1,2$ \\
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\bot & $\nege 1,4$
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\end{subproof}
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\lnot\varphi & $\negi 3-5$
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\end{logicproof}
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