Description: Special case of equsexv proved from core axioms, ax-10 (modal5), and hba1 (modal4). (Contributed by BJ, 29-Dec-2020) (Proof modification is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | bj-equsexval.1 | ||
Assertion | bj-equsexval |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bj-equsexval.1 | ||
2 | 1 | pm5.32i | |
3 | 2 | exbii | |
4 | ax6ev | ||
5 | bj-19.41al | ||
6 | 4 5 | mpbiran | |
7 | 3 6 | bitri |