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

On 20 March 2012 12:27, Jerzy Karczmarczuk 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: WHICH GOOD REASONS??

Because there are no sensible ways of writing such instances? -- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com