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Theorem nottru 1348
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
nottru

Proof of Theorem nottru
StepHypRef Expression
1 df-fal 1320 . 2
21bicomi 193 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176   wtru 1316   wfal 1317
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 177  df-fal 1320
This theorem is referenced by:  trubifal  1351  trunantru  1354  truxortru  1358  falxorfal  1361
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