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Theorem falimfal 1347
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
falimfal (( ⊥ → ⊥ ) ↔ ⊤ )

Proof of Theorem falimfal
StepHypRef Expression
1 id 19 . 2 ( ⊥ → ⊥ )
21bitru 1326 1 (( ⊥ → ⊥ ) ↔ ⊤ )
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 176  wtru 1316  wfal 1317
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 177  df-tru 1319
This theorem is referenced by: (None)
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