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Theorem pm5.12 860
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 pm2.51 147 . 2  |-  ( -.  ( ph  ->  ps )  ->  ( ph  ->  -. 
ps ) )
21orri 367 1  |-  ( (
ph  ->  ps )  \/  ( ph  ->  -.  ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 5    -> wi 6    \/ wo 359
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10
This theorem depends on definitions:  df-bi 179  df-or 361
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