Theorem
pm2.32
Theorem *2.32 of [WhiteheadRussell] p. 105. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee \psi \vee \chi \rightarrow \varphi \vee (\psi \vee \chi) \)
Proof
orass
biimpi
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