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Theorem pm2.3 594
Description: Theorem *2.3 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.3 ((𝜑 ∨ (𝜓𝜒)) → (𝜑 ∨ (𝜒𝜓)))

Proof of Theorem pm2.3
StepHypRef Expression
1 pm1.4 400 . 2 ((𝜓𝜒) → (𝜒𝜓))
21orim2i 539 1 ((𝜑 ∨ (𝜓𝜒)) → (𝜑 ∨ (𝜒𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 382
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 196  df-or 384
This theorem is referenced by:  meran1  31374  meran3  31376
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