This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.

Metamath Proof Explorer

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