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Related theorems Unicode version |
| Description: Equality theorem for a binary relation. |
| Ref | Expression |
|---|---|
| breq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 3158 |
. . 3
| |
| 2 | 1 | eleq1d 1963 |
. 2
|
| 3 | df-br 3339 |
. 2
| |
| 4 | df-br 3339 |
. 2
| |
| 5 | 2, 3, 4 | 3bitr4g 614 |
1
|