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20Nxx - Other generalizations of groups
| 20N02 |
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Sets with a single binary operation (groupoids) |
| 20N05 |
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Loops, quasigroups |
| 20N10 |
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Ternary systems (heaps, semiheaps, heapoids, etc.) |
| 20N15 |
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$n$-ary systems $(n\ge 3)$ |
| 20N20 |
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Hypergroups |
| 20N25 |
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Fuzzy groups |
| 20N99 |
- |
Miscellaneous |
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