4 ms·

> A monoid could also be the natural numbers combined with addition for example. Then you can think of it as concatenating two unary numbers.

• Filligree 13y ago
  Or multiplication.
  • Dewie 13y ago
    n * m is the concatenation of n, applied m times. n * 1 then means to concatenate one n with nothing, yielding n, ie. the identity.
    • judk 13y ago
      But that's a different kind of concatenation, not the concatenation of m and n.
    • Filligree 13y ago
      All right, I'm game. How about function compositions? :-)