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6 lines
200 B
6 lines
200 B
This sequent is not provable.\\
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$\mathcal{M} : p = T, q = T, r = T, s = T$\\
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$\mathcal{M} \models p \imp (q \lor r)$\\
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$\mathcal{M} \models q \imp s$\\
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$\mathcal{M} \models \neg(p \imp (q \land s))$
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