Description: Equality theorem for class substitution. (Contributed by Mario Carneiro, 9-Feb-2017) (Revised by NM, 30-Jun-2018)
Ref | Expression | ||
---|---|---|---|
Hypothesis | sbceq1d.1 | |
|
Assertion | sbceq1d | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbceq1d.1 | |
|
2 | dfsbcq | |
|
3 | 1 2 | syl | |