Theorem dmexd

Description: The domain of a set is a set. (Contributed by Glauco Siliprandi, 26-Jun-2021)

	Ref	Expression
Hypothesis	dmexd.1	|- ( ph -> A e. V )
Assertion	dmexd	|- ( ph -> dom A e. _V )

Proof

Step	Hyp	Ref	Expression
1		dmexd.1	|- ( ph -> A e. V )
2		dmexg	|- ( A e. V -> dom A e. _V )
3	1 2	syl	|- ( ph -> dom A e. _V )