Theorem bj-clex

Description: Sethood of certain classes. (Contributed by BJ, 2-Apr-2019)

	Ref	Expression
Assertion	bj-clex	|- ( A e. V -> { x | { x } e. ( A " B ) } e. _V )

Proof

Step	Hyp	Ref	Expression
1		imaexg	|- ( A e. V -> ( A " B ) e. _V )
2		bj-snsetex	|- ( ( A " B ) e. _V -> { x | { x } e. ( A " B ) } e. _V )
3	1 2	syl	|- ( A e. V -> { x | { x } e. ( A " B ) } e. _V )