Theorem
pm2.63
Theorem *2.63 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee \psi \rightarrow \neg \varphi \vee \psi \rightarrow \psi \)
Proof
l0
pm2.53
idd
jaod
l0
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