Description: Version of cbvexd 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-cbvaldv.1 | |
|
bj-cbvaldv.2 | |
||
bj-cbvaldv.3 | |
||
Assertion | bj-cbvexdv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-cbvaldv.1 | |
|
2 | bj-cbvaldv.2 | |
|
3 | bj-cbvaldv.3 | |
|
4 | 2 | nfnd | |
5 | notbi | |
|
6 | 3 5 | imbitrdi | |
7 | 1 4 6 | bj-cbvaldv | |
8 | 7 | notbid | |
9 | df-ex | |
|
10 | df-ex | |
|
11 | 8 9 10 | 3bitr4g | |