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| Mirrors > Home > MPE Home > Th. List > prcom | Structured version Visualization version Unicode version | ||
| Description: Commutative law for unordered pairs. (Contributed by NM, 15-Jul-1993.) |
| Ref | Expression |
|---|---|
| prcom |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | uncom 3757 |
. 2
| |
| 2 | df-pr 4180 |
. 2
| |
| 3 | df-pr 4180 |
. 2
| |
| 4 | 1, 2, 3 | 3eqtr4i 2654 |
1
|
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