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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 |
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