Metamath Proof Explorer


Theorem falorfal

Description: A \/ identity. (Contributed by Anthony Hart, 22-Oct-2010) (Proof shortened by Andrew Salmon, 13-May-2011)

Ref Expression
Assertion falorfal ( ( ⊥ ∨ ⊥ ) ↔ ⊥ )

Proof

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