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Theorem pm2.51 645
Description: Theorem *2.51 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.51  |-  ( -.  ( ph  ->  ps )  ->  ( ph  ->  -. 
ps ) )

Proof of Theorem pm2.51
StepHypRef Expression
1 conax1k 644 1  |-  ( -.  ( ph  ->  ps )  ->  ( ph  ->  -. 
ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-in1 604  ax-in2 605
This theorem is referenced by: (None)
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