Theorem nfaba1g

Description: Bound-variable hypothesis builder for a class abstraction. Usage of this theorem is discouraged because it depends on ax-13 . See nfaba1 for a version with a disjoint variable condition, but not requiring ax-13 . (Contributed by Mario Carneiro, 14-Oct-2016) (New usage is discouraged.)

	Ref	Expression
Assertion	nfaba1g	$$⊢\underset{\_}{Ⅎ}x\left\{y|\forall x\phi \right\}$$

Proof

Step	Hyp	Ref	Expression
1		nfa1	$$⊢Ⅎx\forall x\phi$$
2	1	nfabg	$$⊢\underset{\_}{Ⅎ}x\left\{y|\forall x\phi \right\}$$