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20Nxx
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Other generalizations of groups
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- 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
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