Re: [Haskell-cafe] function arithmetic?

To clarify in Bobs remark : while you're still learning Haskell and the type system , things like lifted Num on functions can lead to some potentially confusing type errors. That said, it's absolutely doable, and can be a very nice / powerful tool when used appropriately. On Sunday, September 1, 2013, Bob Ippolito wrote:

Yes, you can do that, but you probably shouldn't.

See also: http://www.haskell.org/haskellwiki/Num_instance_for_functions http://hackage.haskell.org/package/applicative-numbers

On Sat, Aug 31, 2013 at 10:01 PM, Christopher Howard < christopher.howard@frigidcode.com > wrote:

...

Hi. I was just curious about something. In one of my math textbooks I see expressions like this

f + g

or

(f + g)(a)

where f and g are functions. What is meant is

f(a) + g(a)

Is there a way in Haskell you can make use of syntax like that (i.e., expressions like f + g and f * g to create a new function), perhaps by loading a module or something?

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