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17 lines
617 B
17 lines
617 B
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\setlength{\subproofhorizspace}{1.5em}
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\begin{logicproof}{2}
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\lnot \exists x \; Q(x) &prem \\
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\begin{subproof}
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\hspace*{-1.5em}
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\llap{$x_0\enspace \;$}
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\begin{subproof}
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Q(x_0) &assum \\
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\exists x \; Q(x) &$\exists \mathrm{i} 2$ \\
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\bot &$\lnot \mathrm{e} 1,3$
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\end{subproof}
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\lnot Q(x_0) &$\lnot \mathrm{i} 2-4$
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\end{subproof}
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\forall x \; \lnot Q(x) &$\forall \mathrm{i} 2-5$
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\end{logicproof}
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