Description: Bound-variable hypothesis builder for a class abstraction. Usage of this theorem is discouraged because it depends on ax-13 . See hbab for a version with more disjoint variable conditions, but not requiring ax-13 . (Contributed by NM, 1-Mar-1995) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | hbabg.1 | |
|
Assertion | hbabg | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | hbabg.1 | |
|
2 | df-clab | |
|
3 | 1 | hbsb | |
4 | 2 3 | hbxfrbi | |