Theorem 1oex

Description: Ordinal 1 is a set. (Contributed by BJ, 6-Apr-2019) (Proof shortened by AV, 1-Jul-2022)

	Ref	Expression
Assertion	1oex	$$⊢1_{𝑜}\in \mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		1on	$$⊢1_{𝑜}\in \mathrm{On}$$
2	1	elexi	$$⊢1_{𝑜}\in \mathrm{V}$$