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Description: Element of the class of transitive relations. (Contributed by Peter Mazsa, 22-Aug-2021)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | eltrrels3 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dftrrels3 | ||
| 2 | breq | ||
| 3 | breq | ||
| 4 | 2 3 | anbi12d | |
| 5 | breq | ||
| 6 | 4 5 | imbi12d | |
| 7 | 6 | 2albidv | |
| 8 | 7 | albidv | |
| 9 | 1 8 | rabeqel |