20Nxx |
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Other generalizations of groups |
20N02 Sets with a single binary operation (groupoids) 20N05 Loops, quasigroups [See also 05Bxx] 20N10 Ternary systems (heaps, semiheaps, heapoids, etc.) 20N15 $n$-ary systems $(n\ge 3)$ 20N20 Hypergroups 20N25 Fuzzy groups [See also 03E72] 20N99 None of the above, but in this section