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Theorem falbifal 1436
Description: A <-> identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)
Assertion
Ref Expression
falbifal

Proof of Theorem falbifal
StepHypRef Expression
1 biid 236 . 2
21bitru 1407 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184   wtru 1396   wfal 1400
This theorem is referenced by:  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-tru 1398
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