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Theorem tbtru 1252
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 1246 . 2
21tbt 236 1
Colors of variables: wff set class
Syntax hints:   wb 98   wtru 1243
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101
This theorem depends on definitions:  df-bi 110  df-tru 1245
This theorem is referenced by: (None)
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