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 | |