[Haskell-cafe] Are there arithmetic composition of functions?

Richard O'Keefe ok at cs.otago.ac.nz
Tue Mar 20 02:16:03 CET 2012

One problem with hooking functions into the Haskell numeric
classes is right at the beginning:

    class (Eq a, Show a) => Num a
      where (+) (-) (*) negate abs signum fromInteger

where functions are for good reason not members of Eq or Show.
Look at


for a different set of numeric classes that should suit you

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