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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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