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