Theorem 1ex

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

	Ref	Expression
Assertion	1ex	⊢ 1 ∈ V

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	⊢ 1 ∈ ℂ
2	1	elexi	⊢ 1 ∈ V