Theorem nfsbc1v

Description: Bound-variable hypothesis builder for class substitution. (Contributed by Mario Carneiro, 12-Oct-2016)

	Ref	Expression
Assertion	nfsbc1v	$$⊢Ⅎx\underset{\dot{}}{[}A/x\underset{\dot{}}{]}\phi$$

Proof

Step	Hyp	Ref	Expression
1		nfcv	$$⊢\underset{\_}{Ⅎ}xA$$
2	1	nfsbc1	$$⊢Ⅎx\underset{\dot{}}{[}A/x\underset{\dot{}}{]}\phi$$