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Theorem truorfal 1294
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truorfal (( ⊤ ⊥ ) ↔ ⊤ )

Proof of Theorem truorfal
StepHypRef Expression
1 tru 1246 . . 3
21orci 649 . 2 ( ⊤ ⊥ )
32bitru 1254 1 (( ⊤ ⊥ ) ↔ ⊤ )
Colors of variables: wff set class
Syntax hints:  wb 98   wo 628  wtru 1243  wfal 1247
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 629
This theorem depends on definitions:  df-bi 110  df-tru 1245
This theorem is referenced by:  truxorfal  1308
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