Metamath Proof Explorer


Theorem cdeqcv

Description: Conditional equality for set-to-class promotion. (Contributed by Mario Carneiro, 11-Aug-2016)

Ref Expression
Assertion cdeqcv CondEq x = y x = y

Proof

Step Hyp Ref Expression
1 id x = y x = y
2 1 cdeqi CondEq x = y x = y