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Metamath Proof Explorer

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	$⊢ (2 = 3 \lor 4 = 4)$

Step	Hyp	Ref	Expression
1		eqid	$⊢ 4 = 4$
2	1	olci	$⊢ (2 = 3 \lor 4 = 4)$