Theorem 1ex

Description: One is a set. (Contributed by David A. Wheeler, 7-Jul-2016)

	Ref	Expression
Assertion	1ex	$$⊢1\in \mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	$$⊢1\in ℂ$$
2	1	elexi	$$⊢1\in \mathrm{V}$$