Theorem vuniex

Description: The union of a setvar is a set. (Contributed by BJ, 3-May-2021) (Revised by BJ, 6-Apr-2024)

	Ref	Expression
Assertion	vuniex	⊢ ∪ 𝑥 ∈ V

Proof

Step	Hyp	Ref	Expression
1		uniex2	⊢ ∃ 𝑦 𝑦 = ∪ 𝑥
2	1	issetri	⊢ ∪ 𝑥 ∈ V