Theorem
pm2.64
Theorem *2.64 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee \psi \rightarrow \varphi \vee \neg \psi \rightarrow \varphi \)
Proof
orel2
jao1i
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com12
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