Theorem onordi

Description: An ordinal number is an ordinal class. (Contributed by NM, 11-Jun-1994)

	Ref	Expression
Hypothesis	on.1	|- A e. On
Assertion	onordi	|- Ord A

Proof

Step	Hyp	Ref	Expression
1		on.1	|- A e. On
2		eloni	|- ( A e. On -> Ord A )
3	1 2	ax-mp	|- Ord A