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Theorem pm1.4 399
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 397 . 2 (𝜑 → (𝜓𝜑))
2 orc 398 . 2 (𝜓 → (𝜓𝜑))
31, 2jaoi 392 1 ((𝜑𝜓) → (𝜓𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 381
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 195  df-or 383
This theorem is referenced by:  orcom  400  orcoms  402  pm2.3  593  pm2.36  883  pm2.37  884  rb-ax2  1668  nfnt  1766  prneimg  4323  orcomdd  32857  rp-fakeanorass  36673  orbi1rVD  37901
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