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Theorem con3 558
Description: Contraposition. Theorem *2.16 of [WhiteheadRussell] p. 103. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 13-Feb-2013.)
Assertion
Ref Expression
con3

Proof of Theorem con3
StepHypRef Expression
1 id 19 . 2
21con3d 548 1
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-in1 532  ax-in2 533
This theorem is referenced by:  mtt  597  con34bdc  758  annimim  775  hbnt  1525  ralf0  3303  ltleletr  6698  ltnsym  6702
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