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Theorem pm3.3 440
Description: Theorem *3.3 (Exp) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 24-Mar-2013.)
Assertion
Ref Expression
pm3.3 (((𝜑𝜓) → 𝜒) → (𝜑 → (𝜓𝜒)))

Proof of Theorem pm3.3
StepHypRef Expression
1 id 22 . 2 (((𝜑𝜓) → 𝜒) → ((𝜑𝜓) → 𝜒))
21expd 405 1 (((𝜑𝜓) → 𝜒) → (𝜑 → (𝜓𝜒)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 385
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 199  df-an 386
This theorem is referenced by:  impexp  442  pm4.79  1027  trer  32823  bj-alanim  33101  bj-mo3OLD  33327  wl-mo3t  33848  trsbc  39526  simplbi2VD  39842  exbirVD  39849  exbiriVD  39850  3impexpVD  39852  trsbcVD  39873  simplbi2comtVD  39884
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