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Theorem truimtru 1343
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truimtru ((⊤ → ⊤) ↔ ⊤)

Proof of Theorem truimtru
StepHypRef Expression
1 id 19 . 2 (⊤ → ⊤)
21bitru 1299 1 ((⊤ → ⊤) ↔ ⊤)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 103  wtru 1288
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106
This theorem depends on definitions:  df-bi 115  df-tru 1290
This theorem is referenced by: (None)
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