| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > opeq2 | Structured version Visualization version Unicode version | ||
| Description: Equality theorem for ordered pairs. (Contributed by NM, 25-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| opeq2 |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq1 2689 |
. . . 4
| |
| 2 | 1 | anbi2d 740 |
. . 3
|
| 3 | preq2 4269 |
. . . 4
| |
| 4 | 3 | preq2d 4275 |
. . 3
|
| 5 | 2, 4 | ifbieq1d 4109 |
. 2
|
| 6 | dfopif 4399 |
. 2
| |
| 7 | dfopif 4399 |
. 2
| |
| 8 | 5, 6, 7 | 3eqtr4g 2681 |
1
|
| Copyright terms: Public domain | W3C validator |