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Theorem pm2.621 398
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 20 . 2  |-  ( (
ph  ->  ps )  -> 
( ph  ->  ps )
)
2 idd 22 . 2  |-  ( (
ph  ->  ps )  -> 
( ps  ->  ps ) )
31, 2jaod 370 1  |-  ( (
ph  ->  ps )  -> 
( ( ph  \/  ps )  ->  ps )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    \/ wo 358
This theorem is referenced by:  pm2.62  399  pm2.73  819  pm4.72  847  undif4  3676  elnn1uz2  10541
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 178  df-or 360
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