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| Mirrors > Home > ILE Home > Th. List > breq1 | Unicode version | ||
| Description: Equality theorem for a binary relation. (Contributed by NM, 31-Dec-1993.) |
| Ref | Expression |
|---|---|
| breq1 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1 3808 |
. . 3
| |
| 2 | 1 | eleq1d 2265 |
. 2
|
| 3 | df-br 4034 |
. 2
| |
| 4 | df-br 4034 |
. 2
| |
| 5 | 2, 3, 4 | 3bitr4g 223 |
1
|
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