[Haskell-beginners] Re: \x -> x < 0.5 && x > -0.5

Christian Maeder wrote:

Hoogle did not find a function of type:

(b -> b -> b) -> (a -> b) -> (a -> b) -> a -> b

or (b -> c -> d) -> (a -> b) -> (a -> c) -> a -> d

But maybe such a function is worth being added to Data.Function.

Hello Christian This is the big Phi or S' combinator. I would certainly second its addition to Data.Function. sprime p q r s = p (q s) (r s) Best wishes Stephen