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11 lines
493 B
11 lines
493 B
\setlength\subproofhorizspace{1em}
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\begin{logicproof}{2}
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\exists x \; (P(x) \imp Q(y)) & prem.\\
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\forall x \; P(x) & prem.\\
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\begin{subproof}
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\llap{$x_0\enspace \;$} P(x_0) \imp Q(y) & ass.\\
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P(x_0) & $\forall \mathrm{e}$ 2\\
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Q(y) & $\imp \mathrm{e}$ 3,4
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\end{subproof}
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Q(y) & $\exists \mathrm{e}$ 3-5
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\end{logicproof}
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