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Mathematical Sciences Classification System

20Mxx - Semigroups

• 1
  20M05
  Free semigroups, generators and relations, word problems [See also 03D40, 08A50, 20F10]
• 6
  20M07
  Varieties and pseudovarieties of semigroups
• 20M10
  General structure theory
• 20M11
  Radical theory
• 1
  20M12
  Ideal theory
• 20M13
  Arithmetic theory of monoids
• 3
  20M14
  Commutative semigroups
• 20M15
  Mappings of semigroups
• 20M17
  Regular semigroups
• 20M18
  Inverse semigroups
• 1
  20M19
  Orthodox semigroups
• 2
  20M20
  Semigroups of transformations, etc. [See also 47D03, 47H20, 54H15]
• 20M25
  Semigroup rings, multiplicative semigroups of rings [See also 16S36, 16Y60]
• 4
  20M30
  Representation of semigroups; actions of semigroups on sets
• 2
  20M32
  Algebraic monoids
• 5
  20M35
  Semigroups in automata theory, linguistics, etc. [See also 03D05, 68Q70, 68T50]
• 20M50
  Connections of semigroups with homological algebra and category theory
• 20M99
  None of the above, but in this section