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Theorem pm5.14 944
Description: Theorem *5.14 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.14 ((𝜑𝜓) ∨ (𝜓𝜒))

Proof of Theorem pm5.14
StepHypRef Expression
1 pm2.521g 177 . 2 (¬ (𝜑𝜓) → (𝜓𝜒))
21orri 859 1 ((𝜑𝜓) ∨ (𝜓𝜒))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 844
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 210  df-or 845
This theorem is referenced by:  pm5.13  945
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