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Theorem pm2.48 415
Description: Theorem *2.48 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.48 (¬ (𝜑𝜓) → (𝜑 ∨ ¬ 𝜓))

Proof of Theorem pm2.48
StepHypRef Expression
1 pm2.46 413 . 2 (¬ (𝜑𝜓) → ¬ 𝜓)
21olcd 408 1 (¬ (𝜑𝜓) → (𝜑 ∨ ¬ 𝜓))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wo 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-or 385
This theorem is referenced by: (None)
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