Theorem 1oelpr

Description: 1o is an element of { (/) , 1o } . (Contributed by Umit Teoman Dogan, 10-Jun-2026)

	Ref	Expression
Assertion	1oelpr	$$⊢1_{𝑜}\in \left\{\varnothing ,1_{𝑜}\right\}$$

Proof

Step	Hyp	Ref	Expression
1		1oex	$$⊢1_{𝑜}\in \mathrm{V}$$
2	1	prid2	$$⊢1_{𝑜}\in \left\{\varnothing ,1_{𝑜}\right\}$$