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| Mirrors > Home > ILE Home > Th. List > opeq12d | Unicode version | ||
| Description: Equality deduction for ordered pairs. (Contributed by NM, 16-Dec-2006.) (Proof shortened by Andrew Salmon, 29-Jun-2011.) |
| Ref | Expression |
|---|---|
| opeq1d.1 |
|
| opeq12d.2 |
|
| Ref | Expression |
|---|---|
| opeq12d |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq1d.1 |
. 2
| |
| 2 | opeq12d.2 |
. 2
| |
| 3 | opeq12 3810 |
. 2
| |
| 4 | 1, 2, 3 | syl2anc 411 |
1
|
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