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8 lines
227 B
8 lines
227 B
\setlength\subproofhorizspace{1em}
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\begin{logicproof}{0}
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x = g(y) & prem.\\
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f(g(y)) = z & prem.\\
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f(x) = y & prem.\\
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f(x) = z & $= \mathrm{e}$ 2,1\\
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y = z & $= \mathrm{e}$ 4,3
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\end{logicproof}
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