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Theorem pm2.76 821
Description: Theorem *2.76 of [WhiteheadRussell] p. 108. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.76  |-  ( (
ph  \/  ( ps  ->  ch ) )  -> 
( ( ph  \/  ps )  ->  ( ph  \/  ch ) ) )

Proof of Theorem pm2.76
StepHypRef Expression
1 orimdi 820 . 2  |-  ( (
ph  \/  ( ps  ->  ch ) )  <->  ( ( ph  \/  ps )  -> 
( ph  \/  ch ) ) )
21biimpi 186 1  |-  ( (
ph  \/  ( ps  ->  ch ) )  -> 
( ( ph  \/  ps )  ->  ( ph  \/  ch ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 357
This theorem is referenced by:  pm2.75  822  pm2.81  824
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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