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Theorem pm1.4 375
Description: Axiom *1.4 of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.4 ((φ ψ) → (ψ φ))

Proof of Theorem pm1.4
StepHypRef Expression
1 olc 373 . 2 (φ → (ψ φ))
2 orc 374 . 2 (ψ → (ψ φ))
31, 2jaoi 368 1 ((φ ψ) → (ψ φ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wo 357
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-or 359
This theorem is referenced by:  orcom  376  orcoms  378  pm2.3  555  pm2.36  816  pm2.37  817  rb-ax2  1518
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