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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 3765 | . . 3 | |
2 | 1 | eleq1d 2239 | . 2 |
3 | df-br 3990 | . 2 | |
4 | df-br 3990 | . 2 | |
5 | 2, 3, 4 | 3bitr4g 222 | 1 |
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