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Theorem pm2.3 691
Description: Theorem *2.3 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.3 ((φ (ψ χ)) → (φ (χ ψ)))

Proof of Theorem pm2.3
StepHypRef Expression
1 pm1.4 645 . 2 ((ψ χ) → (χ ψ))
21orim2i 677 1 ((φ (ψ χ)) → (φ (χ ψ)))
Colors of variables: wff set class
Syntax hints:  wi 4   wo 628
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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