Theorem elexd

Description: If a class is a member of another class, then it is a set. Deduction associated with elex . (Contributed by Glauco Siliprandi, 11-Oct-2020)

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

Proof

Step	Hyp	Ref	Expression
1		elexd.1	|- ( ph -> A e. V )
2		elex	|- ( A e. V -> A e. _V )
3	1 2	syl	|- ( ph -> A e. _V )