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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.)
Assertion
Ref Expression
pm5.13  |-  ( (
ph  ->  ps )  \/  ( ps  ->  ph )
)

Proof of Theorem pm5.13
StepHypRef Expression
1 pm5.14 856 1  |-  ( (
ph  ->  ps )  \/  ( ps  ->  ph )
)
Colors of variables: wff set 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
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