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Theorem pm2.621 399
Description: Theorem *2.621 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.621  |-  ( (
ph  ->  ps )  -> 
( ( ph  \/  ps )  ->  ps )
)

Proof of Theorem pm2.621
StepHypRef Expression
1 id 21 . 2  |-  ( (
ph  ->  ps )  -> 
( ph  ->  ps )
)
2 idd 23 . 2  |-  ( (
ph  ->  ps )  -> 
( ps  ->  ps ) )
31, 2jaod 371 1  |-  ( (
ph  ->  ps )  -> 
( ( ph  \/  ps )  ->  ps )
)
Colors of variables: wff set class
Syntax hints:    -> wi 6    \/ wo 359
This theorem is referenced by:  pm2.62  400  pm2.73  821  pm4.72  851  undif4  3418  elnn1uz2  10173
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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