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6 lines
356 B
6 lines
356 B
\item \lect Consider the formula $$\phi = \exists x \forall y \; \big( P(x,y) \imp (Q(x,y) \lor R(x,y))\big).$$
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Does the following model $\mathcal{M}$ satisfy the formula? \\
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$\mathcal{A} = \{a,b\}$ \\
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$P^\mathcal{M} = \{(a,a),(a,b)\}$ \\
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$Q^\mathcal{M} = \{(a,a),(b,a)\}$\\
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$R^\mathcal{M} = \{(a,a),(b,b)\}$
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