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Theorem nottru 1431
Description: A -. identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
nottru

Proof of Theorem nottru
StepHypRef Expression
1 df-fal 1401 . 2
21bicomi 202 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184   wtru 1396   wfal 1400
This theorem is referenced by:  trubifal  1434  trunantru  1437  truxortru  1441  falxorfal  1444
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-fal 1401
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