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Theorem nbfal 1406
Description: The negation of a proposition is equivalent to itself being equivalent to . (Contributed by Anthony Hart, 14-Aug-2011.)
Assertion
Ref Expression
nbfal

Proof of Theorem nbfal
StepHypRef Expression
1 fal 1402 . 2
21nbn 347 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184   wfal 1400
This theorem is referenced by:  zfnuleu  4578  rusgra0edg  24955  bisym1  29884  aisfina  32093  lindslinindsimp2  33064
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-tru 1398  df-fal 1401
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