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Theorem pm2.63 763
Description: Theorem *2.63 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.63  |-  ( (
ph  \/  ps )  ->  ( ( -.  ph  \/  ps )  ->  ps ) )

Proof of Theorem pm2.63
StepHypRef Expression
1 pm2.53 362 . 2  |-  ( (
ph  \/  ps )  ->  ( -.  ph  ->  ps ) )
2 idd 21 . 2  |-  ( (
ph  \/  ps )  ->  ( ps  ->  ps ) )
31, 2jaod 369 1  |-  ( (
ph  \/  ps )  ->  ( ( -.  ph  \/  ps )  ->  ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    \/ wo 357
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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