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Theorem pm5.13 857
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 pm5.14 856 1 ((φψ) (ψφ))
Colors of variables: wff setvar class
Syntax hints:  wi 4   wo 357
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-or 359
This theorem is referenced by: (None)
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