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Theorem tbtru 1334
Description: If something is true, it outputs  T.. (Contributed by Anthony Hart, 14-Aug-2011.)
Assertion
Ref Expression
tbtru  |-  ( ph  <->  (
ph 
<->  T.  ) )

Proof of Theorem tbtru
StepHypRef Expression
1 tru 1331 . 2  |-  T.
21tbt 335 1  |-  ( ph  <->  (
ph 
<->  T.  ) )
Colors of variables: wff set class
Syntax hints:    <-> wb 178    T. wtru 1326
This theorem is referenced by:  aistia  27843
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 179  df-tru 1329
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