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Axiom ax-in2 616
Description: 'Not' elimination. One of the axioms of propositional logic. (Contributed by Mario Carneiro, 31-Jan-2015.)
Assertion
Ref Expression
ax-in2  |-  ( -. 
ph  ->  ( ph  ->  ps ) )

Detailed syntax breakdown of Axiom ax-in2
StepHypRef Expression
1 wph . . 3  wff  ph
21wn 3 . 2  wff  -.  ph
3 wps . . 3  wff  ps
41, 3wi 4 . 2  wff  ( ph  ->  ps )
52, 4wi 4 1  wff  ( -. 
ph  ->  ( ph  ->  ps ) )
Colors of variables: wff set class
This axiom is referenced by:  pm2.21  618  con2d  625  imorr  722  dcim  842  condcOLD  855  pm5.14dc  912  pm5.54dc  919  mon  2067  difin  3387  indifdir  3406  sosng  4717  iotanul  5211
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