Theorem
pm5.31
Theorem *5.31 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \chi \wedge (\varphi \rightarrow \psi) \rightarrow \varphi \rightarrow \psi \wedge \chi \)
Proof
l0
simpr
simpl
jctird
l0
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