Description: Alternate definition of the conditional operator for classes, which used to be the main definition. (Contributed by BJ, 26-Dec-2023) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-dfif | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-df-ifc | |
|
2 | df-ifp | |
|
3 | 2 | abbii | |
4 | 1 3 | eqtri | |