Theorem rabexgOLD

Description: Obsolete proof of rabexg as of 24-Jul-2025). (Contributed by NM, 23-Oct-1999) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	rabexgOLD	|- ( A e. V -> { x e. A | ph } e. _V )

Proof

Step	Hyp	Ref	Expression
1		ssrab2	|- { x e. A | ph } C_ A
2		ssexg	|- ( ( { x e. A | ph } C_ A /\ A e. V ) -> { x e. A | ph } e. _V )
3	1 2	mpan	|- ( A e. V -> { x e. A | ph } e. _V )