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Theorem exp42 638
Description: An exportation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
Ref Expression
exp42.1 (((𝜑 ∧ (𝜓𝜒)) ∧ 𝜃) → 𝜏)
Assertion
Ref Expression
exp42 (𝜑 → (𝜓 → (𝜒 → (𝜃𝜏))))

Proof of Theorem exp42
StepHypRef Expression
1 exp42.1 . . 3 (((𝜑 ∧ (𝜓𝜒)) ∧ 𝜃) → 𝜏)
21exp31 629 . 2 (𝜑 → ((𝜓𝜒) → (𝜃𝜏)))
32expd 451 1 (𝜑 → (𝜓 → (𝜒 → (𝜃𝜏))))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383
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 197  df-an 385
This theorem is referenced by:  isofrlem  6630  f1ocnv2d  6928  oelim  7659  zorn2lem7  9362  addid1  10254  initoeu1  16708  termoeu1  16715  issubg4  17660  lmodvsdir  18935  lmodvsass  18936  gsummatr01lem4  20512  dvfsumrlim3  23841  wwlksext2clwwlk  27021  shscli  28304  f1o3d  29559  slmdvsdir  29897  slmdvsass  29898  lshpcmp  34593
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