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