Description: Remove a DV condition from bj-ax12v (using core axioms only). (Contributed by BJ, 26-Dec-2020) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Assertion | bj-ax12 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-ax12v | |
|
2 | equequ2 | |
|
3 | 2 | imbi1d | |
4 | 3 | albidv | |
5 | 4 | imbi2d | |
6 | 2 5 | imbi12d | |
7 | 6 | albidv | |
8 | 1 7 | mpbii | |
9 | ax6ev | |
|
10 | 8 9 | exlimiiv | |