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Theorem truortru 1312
Description: A  \/ identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)
Assertion
Ref Expression
truortru  |-  ( ( T.  \/ T.  )  <-> T.  )

Proof of Theorem truortru
StepHypRef Expression
1 oridm 684 1  |-  ( ( T.  \/ T.  )  <-> T.  )
Colors of variables: wff set class
Syntax hints:    <-> wb 102    \/ wo 639   T. wtru 1260
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 103  ax-ia2 104  ax-ia3 105  ax-io 640
This theorem depends on definitions:  df-bi 114
This theorem is referenced by: (None)
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