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12 lines
289 B
12 lines
289 B
This sequent is not provable.
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Model $\mathcal{M}$:\\
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\begin{minipage}{0.2\textwidth}
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\begin{align*}
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\mathcal{A} =& \; \{ a \}\\
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P^\mathcal{M} =& \; \{ a\}
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\end{align*}
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\end{minipage}\\
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$\mathcal{M} \models \lnot \exists x \lnot P(x)$\\
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$\mathcal{M} \nmodels \forall x \lnot P(x)$
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