| Metamath Proof Explorer |
< Previous
Next >
Related theorems Unicode version |
| Description: Equality theorem for a binary relation. |
| Ref | Expression |
|---|---|
| breq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 2483 |
. . 3
| |
| 2 | 1 | eleq1d 1537 |
. 2
|
| 3 | df-br 2615 |
. 2
| |
| 4 | df-br 2615 |
. 2
| |
| 5 | 2, 3, 4 | 3bitr4g 554 |
1
|