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Theorem pm2.24 551
Description: Theorem *2.24 of [WhiteheadRussell] p. 104. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.24  |-  ( ph  ->  ( -.  ph  ->  ps ) )

Proof of Theorem pm2.24
StepHypRef Expression
1 pm2.21 547 . 2  |-  ( -. 
ph  ->  ( ph  ->  ps ) )
21com12 27 1  |-  ( ph  ->  ( -.  ph  ->  ps ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-in2 545
This theorem is referenced by:  pm2.24d  552  pm2.53  641  pm2.82  725  pm4.81dc  814  dedlema  876  alexim  1536  sotritric  4061  ltxrlt  7085  zltnle  8291  elfzonlteqm1  9066  qltnle  9101
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