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Theorem pm2.83 71
Description: Theorem *2.83 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.83 ((φ → (ψχ)) → ((φ → (χθ)) → (φ → (ψθ))))

Proof of Theorem pm2.83
StepHypRef Expression
1 imim1 70 . 2 ((ψχ) → ((χθ) → (ψθ)))
21imim3i 55 1 ((φ → (ψχ)) → ((φ → (χθ)) → (φ → (ψθ))))
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
This theorem is referenced by: (None)
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