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