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Theorem orim2 736
Description: Axiom *1.6 (Sum) of [WhiteheadRussell] p. 97. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
orim2  |-  ( ( ps  ->  ch )  ->  ( ( ph  \/  ps )  ->  ( ph  \/  ch ) ) )

Proof of Theorem orim2
StepHypRef Expression
1 id 19 . 2  |-  ( ( ps  ->  ch )  ->  ( ps  ->  ch ) )
21orim2d 735 1  |-  ( ( ps  ->  ch )  ->  ( ( ph  \/  ps )  ->  ( ph  \/  ch ) ) )
Colors of variables: wff set class
Syntax hints:    -> 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-ia3 106  ax-io 663
This theorem depends on definitions:  df-bi 115
This theorem is referenced by:  pm2.76  755  pm2.81  758
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