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Theorem nsyl4 136
Description: A negated syllogism inference. (Contributed by NM, 15-Feb-1996.)
Hypotheses
Ref Expression
nsyl4.1  |-  ( ph  ->  ps )
nsyl4.2  |-  ( -. 
ph  ->  ch )
Assertion
Ref Expression
nsyl4  |-  ( -. 
ch  ->  ps )

Proof of Theorem nsyl4
StepHypRef Expression
1 nsyl4.2 . . 3  |-  ( -. 
ph  ->  ch )
21con1i 123 . 2  |-  ( -. 
ch  ->  ph )
3 nsyl4.1 . 2  |-  ( ph  ->  ps )
42, 3syl 16 1  |-  ( -. 
ch  ->  ps )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4
This theorem is referenced by:  pm5.55  868  ax6o  1766  hbimdOLD  1835  naecoms  2037  ax6  2224  ax467  2246  ax467to7  2249  naecoms-o  2255  nfunsn  5761  card2on  7522  carden2a  7853  ax4567  27578  ax4567to7  27582  afvco2  28016  naecomsNEW7  29619
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
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