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Theorem pm2.3 725
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 pm1.4 679 . 2 ((𝜓𝜒) → (𝜒𝜓))
21orim2i 711 1 ((𝜑 ∨ (𝜓𝜒)) → (𝜑 ∨ (𝜒𝜓)))
Colors of variables: wff set class
Syntax hints:  wi 4  wo 662
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663
This theorem depends on definitions:  df-bi 115
This theorem is referenced by: (None)
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