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Theorem con3 126
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 125 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:  pm2.65  164  con34b  283  nic-ax  1438  nic-axALT  1439  exim  1575  hbnt  1775  nfndOLD  1792  hbimdOLD  1816  equsalhwOLD  1839  dvelimv  1939  ax9o  1950  ax11indn  2195  rexim  2718  ralf0  3656
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