Theorem
pm5.44
Theorem *5.44 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\varphi \rightarrow \psi) \rightarrow (\varphi \rightarrow \chi \leftrightarrow \varphi \rightarrow \psi \wedge \chi) \)
Proof
jcab
baibr
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