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| Mirrors > Home > QLE Home > Th. List > ancom | Unicode version | ||
| Description: Commutative law. |
| Ref | Expression |
|---|---|
| ancom |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-a2 31 |
. . 3
| |
| 2 | 1 | ax-r4 37 |
. 2
|
| 3 | df-a 40 |
. 2
| |
| 4 | df-a 40 |
. 2
| |
| 5 | 2, 3, 4 | 3tr1 63 |
1
|
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