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13 lines
365 B
13 lines
365 B
\begin{logicproof}{2}
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p \implies q & \prem \\
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\begin{subproof}
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r \implies p & \assum \\
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\begin{subproof}
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r & \assum \\
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p & $\impe 2,3$ \\
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q & $\impe 1,4$
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\end{subproof}
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r \implies q & $\impi 3-5$
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\end{subproof}
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(r \implies p) \implies (r \implies q) & $\impi 2-6$
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\end{logicproof}
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