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Theorem pm2.26 858
Description: Theorem *2.26 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 23-Nov-2012.)
Assertion
Ref Expression
pm2.26  |-  ( -. 
ph  \/  ( ( ph  ->  ps )  ->  ps ) )

Proof of Theorem pm2.26
StepHypRef Expression
1 pm2.27 37 . 2  |-  ( ph  ->  ( ( ph  ->  ps )  ->  ps )
)
21imori 404 1  |-  ( -. 
ph  \/  ( ( ph  ->  ps )  ->  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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