Theorem
pm4.77
Theorem *4.77 of [WhiteheadRussell] p. 121. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash (\psi \rightarrow \varphi) \wedge (\chi \rightarrow \varphi) \leftrightarrow \psi \vee \chi \rightarrow \varphi \)
Proof
jaob
bicomi
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