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13 lines
332 B
13 lines
332 B
This sequent is provable.
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\begin{logicproof}{1}
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p \land q & \prem\\
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\begin{subproof}
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\neg(p \land q) & \assum\\
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p \land q & $\copying 1$\\
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\bot & $\nege 2,3$\\
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r & $\bote 3$
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\end{subproof}
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\neg(p \land q) \imp r & $\impi 2-5$\\
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((\neg(p \land q))\imp r ) \lor ((q \imp s) \land t) & $\ori{1} 6$
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\end{logicproof}
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