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8 lines
315 B
8 lines
315 B
\item \self Consider the following formula.
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$$\phi \coloneqq \forall y \big(P(x) \land Q(y)\big) \rightarrow \exists x \big(R(y) \land Q(x)\big)$$
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\begin{enumerate}
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\item Compute $\phi[f(y)/x]$.
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\item Compute $\phi[f(x)/y]$.
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\item Compute $\phi[k/z]$.
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\item Compute $\phi[x/z]$.
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\end{enumerate}
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