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Theorem pm3.22 436
Description: Theorem *3.22 of [WhiteheadRussell] p. 111. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 13-Nov-2012.)
Assertion
Ref Expression
pm3.22 ((φ ψ) → (ψ φ))

Proof of Theorem pm3.22
StepHypRef Expression
1 pm3.21 435 . 2 (φ → (ψ → (ψ φ)))
21imp 418 1 ((φ ψ) → (ψ φ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wa 358
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-an 360
This theorem is referenced by:  ancom  437  ancom2s  777  ancom1s  780  eupickb  2269
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