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12 lines
321 B
12 lines
321 B
\begin{center}
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\vspace{-0.5cm}
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\begin{prooftree}
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\AxiomC{$ \varphi $}
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\AxiomC{$ \psi $}
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\RightLabel{$ \land $i}
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\BinaryInfC{$ \varphi \land \psi $}
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\end{prooftree}
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\end{center}
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If we have two formulas that are known to be true separately, then we can
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conclude that the conjunction of the two premises must also be true.
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