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Theorem tbtru 1405
Description: A proposition is equivalent to itself being equivalent to . (Contributed by Anthony Hart, 14-Aug-2011.)
Assertion
Ref Expression
tbtru

Proof of Theorem tbtru
StepHypRef Expression
1 tru 1399 . 2
21tbt 344 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184   wtru 1396
This theorem is referenced by:  sgn3da  28480  aistia  32092
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
  Copyright terms: Public domain W3C validator