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Theorem pm1.4 866
Description: Axiom *1.4 of [WhiteheadRussell] p. 96. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm1.4 ((𝜑𝜓) → (𝜓𝜑))

Proof of Theorem pm1.4
StepHypRef Expression
1 olc 865 . 2 (𝜑 → (𝜓𝜑))
2 orc 864 . 2 (𝜓 → (𝜓𝜑))
31, 2jaoi 854 1 ((𝜑𝜓) → (𝜓𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 844
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 210  df-or 845
This theorem is referenced by:  orcom  867  orcoms  869  pm2.3  922  pm2.36  967  pm2.37  968  rb-ax2  1755  prneimg  4748  cnf2dd  35522  orcomdd  35598  rp-fakeanorass  40208  orbi1rVD  41541  itsclc0yqsol  45165
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