Theorem ex-or

Description: Example for df-or . Example by David A. Wheeler. (Contributed by Mario Carneiro, 9-May-2015)

	Ref	Expression
Assertion	ex-or	⊢ ( 2 = 3 ∨ 4 = 4 )

Proof

Step	Hyp	Ref	Expression
1		eqid	⊢ 4 = 4
2	1	olci	⊢ ( 2 = 3 ∨ 4 = 4 )