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11 lines
323 B
11 lines
323 B
This sequent is provable.
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\begin{logicproof}{1}
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p \land q & \prem \\
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r \imp s & \prem \\
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p & $\ande{1} 1$ \\
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p \lor (r \imp s) & $\ori{1} 3$ \\
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q & $\ande{2} 1$ \\
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q \lor ((t \lor r) \imp u) & $\ori{1} 5$ \\
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(p \lor (r \imp s)) \land (q \lor ((t \lor r) \imp u)) & $\andi 4,6$
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\end{logicproof}
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