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Theorem pm2.24 584
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 pm2.21 580 . 2  |-  ( -. 
ph  ->  ( ph  ->  ps ) )
21com12 30 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 578
This theorem is referenced by:  pm2.24d  585  pm2.53  674  pm2.82  759  pm4.81dc  848  dedlema  911  alexim  1577  eqneqall  2256  sotritric  4087  ltxrlt  7245  zltnle  8478  elfzonlteqm1  9296  qltnle  9332  dfgcd2  10547
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