Metamath Proof Explorer


Theorem elon

Description: An ordinal number is an ordinal set. (Contributed by NM, 5-Jun-1994)

Ref Expression
Hypothesis elon.1 AV
Assertion elon AOnOrdA

Proof

Step Hyp Ref Expression
1 elon.1 AV
2 elong AVAOnOrdA
3 1 2 ax-mp AOnOrdA