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

Ivan Lazar Miljenovic ivan.miljenovic at gmail.com
Tue Mar 20 03:03:41 CET 2012

On 20 March 2012 12:27, Jerzy Karczmarczuk
<jerzy.karczmarczuk at unicaen.fr> wrote:
> Richard O'Keefe:
>     class (Eq a, Show a) => Num a
>       where (+) (-) (*) negate abs signum fromInteger
> where functions are for good reason not members of Eq or Show.
> This is an old song, changed several times. I have no intention to discuss,
> but please, Richard O'Keefe:

Because there are no sensible ways of writing such instances?

Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com

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