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	$$⊢\bigcup x\in \mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		uniex2	$$⊢\exists yy=\bigcup x$$
2	1	issetri	$$⊢\bigcup x\in \mathrm{V}$$