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10 lines
474 B
10 lines
474 B
\setlength\subproofhorizspace{1em}
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\begin{logicproof}{0}
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\forall x \; (P(x) \imp Q(y)) & prem.\\
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\forall y \; (P(y) \land R(x)) & prem.\\
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P(t) \imp Q(y) & $\forall \mathrm{e}$ 1\\
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P(t) \land R(x) & $\forall \mathrm{e}$ 2\\
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P(t) & $\land \mathrm{e}_1$ 4\\
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Q(y) & $\imp \mathrm{e}$ 3\\
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\exists x \; Q(x) & $\exists \mathrm{i}$ 6
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\end{logicproof}
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