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Mathematical Sciences Classification System

20Nxx - Other generalizations of groups

• 5
  20N02
  Sets with a single binary operation (groupoids)
• 8
  20N05
  Loops, quasigroups [See also 05Bxx]
• 1
  20N10
  Ternary systems (heaps, semiheaps, heapoids, etc.)
• 1
  20N15
  $n$-ary systems $(n\ge 3)$
• 3
  20N20
  Hypergroups
• 20N25
  Fuzzy groups [See also 03E72]
• 20N99
  None of the above, but in this section