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Theorem pm2.41 750
Description: Theorem *2.41 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.41 ((𝜓 ∨ (𝜑𝜓)) → (𝜑𝜓))

Proof of Theorem pm2.41
StepHypRef Expression
1 olc 685 . 2 (𝜓 → (𝜑𝜓))
2 id 19 . 2 ((𝜑𝜓) → (𝜑𝜓))
31, 2jaoi 690 1 ((𝜓 ∨ (𝜑𝜓)) → (𝜑𝜓))
Colors of variables: wff set class
Syntax hints:  wi 4  wo 682
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 683
This theorem depends on definitions:  df-bi 116
This theorem is referenced by: (None)
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