Theorem
pm3.43
Theorem *3.43 (Comp) of [WhiteheadRussell] p. 113. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\varphi \rightarrow \psi) \wedge (\varphi \rightarrow \chi) \rightarrow \varphi \rightarrow \psi \wedge \chi \)
Proof
pm3.43i
imp
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