Metamath Proof Explorer


Theorem fvexi

Description: The value of a class exists. Inference form of fvex . (Contributed by Glauco Siliprandi, 23-Oct-2021)

Ref Expression
Hypothesis fvexi.1 A=FB
Assertion fvexi AV

Proof

Step Hyp Ref Expression
1 fvexi.1 A=FB
2 fvex FBV
3 1 2 eqeltri AV