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Theorem truimtru 1419
Description: A  -> identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truimtru  |-  ( ( T.  -> T.  )  <-> T.  )

Proof of Theorem truimtru
StepHypRef Expression
1 id 19 . 2  |-  ( T. 
-> T.  )
21bitru 1375 1  |-  ( ( T.  -> T.  )  <-> T.  )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105   T. wtru 1364
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108
This theorem depends on definitions:  df-bi 117  df-tru 1366
This theorem is referenced by: (None)
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