[Haskell-beginners] Still confused

[Marc Gorenstein]

> 
> Yes. A section is just this conversion of an infix operator to a prefix 
function, but with one parameter carried along with it. You can supply it on 
either side as appropriate; (/ 8) is the same as (\x -> x / 8) which in turn 
is the same as (\x -> (/) x 8), whereas (8 /) is (\x -> 8 / x) is (\x -> (/) 8 
x). Note that it must be *inside* the parentheses to be a section; if it's 
outside, then it's a normal function (not operator!) parameter.

Thanks again.

Now I also understand why 
Prelude> ( $ 4 ) sqrt
2.0

because it is equivalent to 
Prelude> (\x -> x 4) sqrt
2.0


Marc