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5 lines
179 B
5 lines
179 B
This sequent is not provable.
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$\mathcal{M} : a = F, b = F, c = F$ \\
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$\mathcal{M} \models \lnot(a \land b) \lor \lnot c$ \\
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$\mathcal{M} \nmodels \lnot (a \land b) \imp c \lor a$
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