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monoid_positive (153B)

      1 # Monoid positive
      2 
      3 A [monoid] being *positive* means x + y = 0 implies x = 0 and y = 0
      4 
      5 aka "zero-sum-free"
      6 
      7 See also: [semiring_positive]
      8 
      9 Up: [monoid]