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10 lines
307 B
10 lines
307 B
\begin{logicproof}{2}
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(p \implies q)
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\implies r & \prem \\
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\begin{subproof}
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\lnot r \land \lnot s & \assum \\
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\lnot r & $\ande{1} 2$ \\
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\lnot (p \implies q) & $\MT 1,3$
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\end{subproof}
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\lnot r \land \lnot s \implies \lnot (p \implies q) & $\impi 2-4$
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\end{logicproof}
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