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Theorem falorfal 1568
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.) (Proof shortened by Andrew Salmon, 13-May-2011.)
Assertion
Ref Expression
falorfal ((⊥ ∨ ⊥) ↔ ⊥)

Proof of Theorem falorfal
StepHypRef Expression
1 oridm 898 1 ((⊥ ∨ ⊥) ↔ ⊥)
Colors of variables: wff setvar class
Syntax hints:  wb 207  wo 841  wfal 1540
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 208  df-or 842
This theorem is referenced by:  falnorfal  1582  falnorfalOLD  1583
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