Theorem falorfal 1343

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

Step	Hyp	Ref	Expression
1		oridm 500	1 ⊢ (( ⊥ ∨ ⊥ ) ↔ ⊥ )

This proof depends on syntax axioms:   ↔ wb 176   ∨ wo 357   ⊥ wfal 1317

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This proof depends on definitions:  df-bi 177  df-or 359

This theorem is used by: (None)