Theorem
pm5.33
Theorem *5.33 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \wedge (\psi \rightarrow \chi) \leftrightarrow \varphi \wedge (\varphi \wedge \psi \rightarrow \chi) \)
Proof
ibar
imbi1d
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pm5.32i
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