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Theorem truanfal 1337
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truanfal

Proof of Theorem truanfal
StepHypRef Expression
1 fal 1322 . . 3
21intnan 880 . 2
32bifal 1327 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wa 358   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-tru 1319  df-fal 1320
This theorem is referenced by:  trunanfal  1355
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