Description: Equality deduction for ordered triples. (Contributed by Mario Carneiro, 11-Jan-2017)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | oteq1d.1 | ||
| oteq123d.2 | |||
| oteq123d.3 | |||
| Assertion | oteq123d | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | oteq1d.1 | ||
| 2 | oteq123d.2 | ||
| 3 | oteq123d.3 | ||
| 4 | 1 | oteq1d | |
| 5 | 2 | oteq2d | |
| 6 | 3 | oteq3d | |
| 7 | 4 5 6 | 3eqtrd |