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Theorem pm5.13 930
Description: Theorem *5.13 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 14-Nov-2012.)
Ref Expression
pm5.13 ((𝜑𝜓) ∨ (𝜓𝜑))

Proof of Theorem pm5.13
StepHypRef Expression
1 pm5.14 929 1 ((𝜑𝜓) ∨ (𝜓𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 833
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 199  df-or 834
This theorem is referenced by: (None)
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