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Theorem falnanfal 1357
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)
Assertion
Ref Expression
falnanfal

Proof of Theorem falnanfal
StepHypRef Expression
1 nannot 1293 . 2
2 notfal 1349 . 2
31, 2bitr3i 242 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176   wnan 1287   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-an 360  df-nan 1288  df-tru 1319  df-fal 1320
This theorem is referenced by: (None)
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