Theorem falorfal 1579

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 904	1 ⊢ ((⊥ ∨ ⊥) ↔ ⊥)

Syntax hints:   ↔ wb 206   ∨ wo 847  ⊥wfal 1551

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 207  df-or 848

This theorem is referenced by:  falnorfal  1591