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13 lines
380 B
13 lines
380 B
This sequent is provable.
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\begin{logicproof}{2}
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\lnot \lnot \lnot p \land q & \prem \\
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\lnot \lnot r & \prem \\
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\lnot \lnot \lnot p & $\ande{1}1$ \\
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q & $\ande{2}1$ \\
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r & $\negnege2$ \\
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\lnot p & $\negnege3$ \\
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\lnot \lnot q & $\negnegi4$ \\
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r \land \lnot p & $\andi 5,6$ \\
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r \land \lnot p \land \lnot \lnot q & $\andi 8,7$
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\end{logicproof}
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