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Theorem falimfal 1375
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 1328 1 ((⊥ → ⊥) ↔ ⊤)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 104  wtru 1317  wfal 1321
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107
This theorem depends on definitions:  df-bi 116  df-tru 1319
This theorem is referenced by: (None)
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