Theorem
pm3.42
Theorem *3.42 of [WhiteheadRussell] p. 113. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\psi \rightarrow \chi) \rightarrow \varphi \wedge \psi \rightarrow \chi \)
Proof
simpr
imim1i
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