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Theorem falorfal 1390
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 747 1 ((⊥ ∨ ⊥) ↔ ⊥)
Colors of variables: wff set class
Syntax hints:  wb 104  wo 698  wfal 1340
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699
This theorem depends on definitions:  df-bi 116
This theorem is referenced by: (None)
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