Theorem
pm2.76
Theorem *2.76 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee (\psi \rightarrow \chi) \rightarrow \varphi \vee \psi \rightarrow \varphi \vee \chi \)
Proof
orimdi
biimpi
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