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Theorem pm2.64 750
Description: Theorem *2.64 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.64  |-  ( (
ph  \/  ps )  ->  ( ( ph  \/  -.  ps )  ->  ph )
)

Proof of Theorem pm2.64
StepHypRef Expression
1 ax-1 5 . . 3  |-  ( ph  ->  ( ( ph  \/  ps )  ->  ph )
)
2 orel2 680 . . 3  |-  ( -. 
ps  ->  ( ( ph  \/  ps )  ->  ph )
)
31, 2jaoi 671 . 2  |-  ( (
ph  \/  -.  ps )  ->  ( ( ph  \/  ps )  ->  ph )
)
43com12 30 1  |-  ( (
ph  \/  ps )  ->  ( ( ph  \/  -.  ps )  ->  ph )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    \/ wo 664
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-in2 580  ax-io 665
This theorem depends on definitions:  df-bi 115
This theorem is referenced by: (None)
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