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

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 http://www.haskell.org/haskellwiki/Numeric_Prelude for a different set of numeric classes that should suit you better.