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Theorem exp42 594
Description: An exportation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
Ref Expression
exp42.1 (((φ (ψ χ)) θ) → τ)
Assertion
Ref Expression
exp42 (φ → (ψ → (χ → (θτ))))

Proof of Theorem exp42
StepHypRef Expression
1 exp42.1 . . 3 (((φ (ψ χ)) θ) → τ)
21exp31 587 . 2 (φ → ((ψ χ) → (θτ)))
32exp3a 425 1 (φ → (ψ → (χ → (θτ))))
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:  f1o2d  5727
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