Theorem nfeq2

Description: Hypothesis builder for equality, special case. (Contributed by Mario Carneiro, 10-Oct-2016)

	Ref	Expression
Hypothesis	nfeq2.1	|- F/_ x B
Assertion	nfeq2	|- F/ x A = B

Proof

Step	Hyp	Ref	Expression
1		nfeq2.1	|- F/_ x B
2		nfcv	|- F/_ x A
3	2 1	nfeq	|- F/ x A = B