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