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Related theorems Unicode version |
| Description: Equality theorem for binary relation. |
| Ref | Expression |
|---|---|
| breq2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq2 2457 |
. . 3
| |
| 2 | 1 | eleq1d 1516 |
. 2
|
| 3 | df-br 2588 |
. 2
| |
| 4 | df-br 2588 |
. 2
| |
| 5 | 2, 3, 4 | 3bitr4g 553 |
1
|