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Theorem con4i 122
Description: Inference rule derived from axiom ax-3 8. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 21-Jun-2013.)
Hypothesis
Ref Expression
con4i.1
Assertion
Ref Expression
con4i

Proof of Theorem con4i
StepHypRef Expression
1 notnot1 114 . 2
2 con4i.1 . 2
31, 2nsyl2 119 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem is referenced by:  pm2.21i  123  mt4  129  modal-b  1752  ax10lem2  1937  ax9from9o  2148  ax67to7  2168  ax467to7  2172  necon2ai  2561  ndmfvrcl  5350  oprssdm  5612  ndmovrcl  5616
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