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19 lines
513 B
19 lines
513 B
This sequent is provable.
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\begin{logicproof}{1}
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p \lor \lnot \lnot q & \prem \\
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\lnot p \land \lnot q & \prem \\
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\begin{subproof}
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p & \assum \\
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\lnot p & $\ande{1} 2$ \\
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\bot & $\nege 3,4$ \\
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s \lor \lnot t & $\bote 5$
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\end{subproof}
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\begin{subproof}
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\lnot \lnot q & \assum \\
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\lnot q & $\ande{2} 2$ \\
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\bot & $\nege 7,8$\\
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s \lor \lnot t & $\bote 9$
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\end{subproof}
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s \lor \lnot t & $\ore 1, 3-6, 7-10$
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\end{logicproof}
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