20Mxx Semigroups
- 20M05 Free semigroups, generators and relations, word problems
- 20M07 Varieties of semigroups
- 20M10 General structure theory
- 20M11 Radical theory
- 20M12 Ideal theory
- 20M14 Commutative semigroups
- 20M15 Mappings of semigroups
- 20M17 Regular semigroups
- 20M18 Inverse semigroups
- 20M19 Orthodox semigroups
- 20M20 Semigroups of transformations, etc., See also {47D03, 47H20, 54H15}
- 20M25 Semigroup rings, multiplicative semigroups of rings, See also {16S36, 16Y60}
- 20M30 Representation of semigroups
- 20M35 Semigroups in automata theory, linguistics, etc., See Also {03D05, 68Qxx, 68S05}
- 20M50 Connections of semigroups with homological algebra and category theory
- 20M99 None of the above but in this section
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