Theorem
pm2.31
Theorem *2.31 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee (\psi \vee \chi) \rightarrow \varphi \vee \psi \vee \chi \)
Proof
orass
biimpri
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