Theorem truortru

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

	Ref	Expression
Assertion	truortru	⊢ ( ( ⊤ ∨ ⊤ ) ↔ ⊤ )

Proof

Step	Hyp	Ref	Expression
1		oridm	⊢ ( ( ⊤ ∨ ⊤ ) ↔ ⊤ )