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Theorem nottru 1473
Description: A  -. identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
nottru  |-  ( -. T.  <-> F.  )

Proof of Theorem nottru
StepHypRef Expression
1 df-fal 1443 . 2  |-  ( F.  <->  -. T.  )
21bicomi 205 1  |-  ( -. T.  <-> F.  )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    <-> wb 187   T. wtru 1438   F. wfal 1442
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 188  df-fal 1443
This theorem is referenced by:  trubifalOLD  1478  trunantru  1481  truxortru  1486  falxorfal  1490
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