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Theorem pm5.12 855
Description: Theorem *5.12 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.12  |-  ( (
ph  ->  ps )  \/  ( ph  ->  -.  ps ) )

Proof of Theorem pm5.12
StepHypRef Expression
1 pm2.51 145 . 2  |-  ( -.  ( ph  ->  ps )  ->  ( ph  ->  -. 
ps ) )
21orri 365 1  |-  ( (
ph  ->  ps )  \/  ( ph  ->  -.  ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> 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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