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Theorem truimtru 1316
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 1271 1 ((⊤ → ⊤) ↔ ⊤)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 102  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
This theorem depends on definitions:  df-bi 114  df-tru 1262
This theorem is referenced by: (None)
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