Theorem
pm1.4
Axiom *1.4 of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Conclusion
\( \vdash \varphi \vee \psi \rightarrow \psi \vee \varphi \)
Proof
l0
olc
orc
jaoi
l0
_
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