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Theorem pm2.73 818
Description: Theorem *2.73 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.73 ((φψ) → (((φ ψ) χ) → (ψ χ)))

Proof of Theorem pm2.73
StepHypRef Expression
1 pm2.621 397 . 2 ((φψ) → ((φ ψ) → ψ))
21orim1d 812 1 ((φψ) → (((φ ψ) χ) → (ψ 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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