Description: Version of cbvex4v with a disjoint variable condition, which does not require ax-13 . (Contributed by BJ, 16-Jun-2019) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypotheses | bj-cbvex4vv.1 | ||
bj-cbvex4vv.2 | |||
Assertion | bj-cbvex4vv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-cbvex4vv.1 | ||
2 | bj-cbvex4vv.2 | ||
3 | 1 | 2exbidv | |
4 | 3 | cbvex2vw | |
5 | 2 | cbvex2vw | |
6 | 5 | 2exbii | |
7 | 4 6 | bitri |