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Theorem pm2.37 817
Description: Theorem *2.37 of [WhiteheadRussell] p. 105. (Contributed by NM, 6-Mar-2008.)
Assertion
Ref Expression
pm2.37 ((ψχ) → ((ψ φ) → (φ χ)))

Proof of Theorem pm2.37
StepHypRef Expression
1 pm2.38 815 . 2 ((ψχ) → ((ψ φ) → (χ φ)))
2 pm1.4 375 . 2 ((χ φ) → (φ χ))
31, 2syl6 29 1 ((ψχ) → ((ψ φ) → (φ χ)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wo 357
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-or 359  df-an 360
This theorem is referenced by: (None)
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