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Theorem pm2.46 691
Description: Theorem *2.46 of [WhiteheadRussell] p. 106. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.46  |-  ( -.  ( ph  \/  ps )  ->  -.  ps )

Proof of Theorem pm2.46
StepHypRef Expression
1 olc 665 . 2  |-  ( ps 
->  ( ph  \/  ps ) )
21con3i 595 1  |-  ( -.  ( ph  \/  ps )  ->  -.  ps )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    \/ wo 662
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-in1 577  ax-in2 578  ax-io 663
This theorem depends on definitions:  df-bi 115
This theorem is referenced by:  pm2.48  693  pm2.49  694  ioran  702  eueq3dc  2776  regexmidlem1  4305
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