Documentation

This is the type class of an ordered ring, satisfying the laws

              a * b === b * a
      a + (max b c) === max (a+b) (a+c)
   negate (max b c) === min (negate b) (negate c)
      a * (max b c) === max (a*b) (a*c) where a >= 0

Note that abs is in a rather different place than it is in the Haskell 98 Prelude. In particular,

   abs :: Complex -> Complex

is not defined. To me, this seems to have the wrong type anyway; Complex.magnitude has the correct type.