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20Nxx - Other generalizations of groups
| 20N02 |
- |
Sets with a single binary operation (groupoids) |
- |
10 |
items |
| 20N05 |
- |
Loops, quasigroups |
- |
9 |
items |
| 20N10 |
- |
Ternary systems (heaps, semiheaps, heapoids, etc.) |
- |
1 |
item |
| 20N15 |
- |
$n$-ary systems $(n\ge 3)$ |
- |
1 |
item |
| 20N20 |
- |
Hypergroups |
- |
1 |
item |
| 20N99 |
- |
Miscellaneous |
- |
1 |
item |
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