Theorem
pm4.45
Theorem *4.45 of [WhiteheadRussell] p. 119. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \leftrightarrow \varphi \wedge (\varphi \vee \psi) \)
Proof
orc
pm4.71i
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