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