Peter Verswyvelen:
> Personally I also find the following a good explanation, since it does 
> not introduce lambdas or other scary things for newbies.
> 
> f . g = composite
>     where composite x = f (g x)
> 

I suppose that the usual definition, which is (f . g) x = f (g x), is
clear enough. No lambdas to be scared of here.
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