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Theorem truortru 1500
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)
Assertion
Ref Expression
truortru ((⊤ ∨ ⊤) ↔ ⊤)

Proof of Theorem truortru
StepHypRef Expression
1 oridm 534 1 ((⊤ ∨ ⊤) ↔ ⊤)
Colors of variables: wff setvar class
Syntax hints:  wb 194  wo 381  wtru 1475
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 195  df-or 383
This theorem is referenced by: (None)
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