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Theorem pm2.6 162
Description: Theorem *2.6 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.6  |-  ( ( -.  ph  ->  ps )  ->  ( ( ph  ->  ps )  ->  ps )
)

Proof of Theorem pm2.6
StepHypRef Expression
1 id 19 . 2  |-  ( ( -.  ph  ->  ps )  ->  ( -.  ph  ->  ps ) )
2 idd 21 . 2  |-  ( ( -.  ph  ->  ps )  ->  ( ps  ->  ps ) )
31, 2jad 154 1  |-  ( ( -.  ph  ->  ps )  ->  ( ( ph  ->  ps )  ->  ps )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem is referenced by:  pm2.61  163
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
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