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Theorem pm2.36 816
Description: Theorem *2.36 of [WhiteheadRussell] p. 105. (Contributed by NM, 6-Mar-2008.)
Assertion
Ref Expression
pm2.36 ((ψχ) → ((φ ψ) → (χ φ)))

Proof of Theorem pm2.36
StepHypRef Expression
1 pm1.4 375 . 2 ((φ ψ) → (ψ φ))
2 pm2.38 815 . 2 ((ψχ) → ((ψ φ) → (χ φ)))
31, 2syl5 28 1 ((ψχ) → ((φ ψ) → (χ φ)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wo 357
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360
This theorem is referenced by: (None)
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