Why not ask the computer?
-- Lennart
bamse% ghci
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 6.4.1, for Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package base-1.0 ... linking ... done.
Prelude> :t (.) . (.)
(.) . (.) :: (b -> c) -> (a -> a1 -> b) -> a -> a1 -> c
Prelude> Leaving GHCi.
bamse% djinn
Welcome to Djinn version 2005-12-12.
Type :h to get help.
Djinn> f ? (b -> c) -> (a -> a1 -> b) -> a -> a1 -> c
f :: (b -> c) -> (a -> a1 -> b) -> a -> a1 -> c
f x1 x2 x3 x4 = x1 (x2 x3 x4)
Djinn> :q
Bye.
Brian Hulley wrote:
Taral wrote:
On 5/28/06, Dominic Steinitz <[EMAIL PROTECTED]>
wrote:
Is this defined in some library? Thanks, Dominic.
Don't think so. I use:
\a b -> f (g a b)
I don't see how (.) . (.) translates into something so simple.
Using c for (.) to make things easier to write, I get:
(.) . (.)
=== c c c
=== \x -> (c c c x)
=== \x -> (c (c x))
=== \x -> (\y z -> c (c x) y z)
=== \x -> (\y z -> (c x) (y z))
=== \x -> (\y z -> (\p q -> c x q p) (y z))
=== \x -> (\y z -> (\p q -> x (q p) (y z))
=== \x -> (\y z -> (\q -> x (q (y z))))
=== \x y z q -> x (q (y z))
Have I made an error somewhere above?
Thanks, Brian.
_______________________________________________
Haskell mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/haskell
