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semigroup (202B)

      1 # Semigroup
      2 
      3 A [set] with a [semigroup_law] which is [associative]
      4 
      5 Special cases:
      6 
      7 - [monoid]
      8 - [group]
      9 - [semigroup_cancellative]
     10 
     11 Examples:
     12 
     13 - [syntactic_semigroup]
     14 
     15 Up: [mathematics_basic_concepts]