Re: [Haskell-cafe] Article review: Category Theory

18 Jan 2007


      Hi,

Am Donnerstag, den 18.01.2007, 15:05 +0100 schrieb Ulf Norell:
...
_|_ . id = \x -> _|_ ≠ _|_
Isn’t _|_ = \x -> _|_? Or better stated: For your first _|_ to be used
in (.), it has to take an argument, therefore it is \x -> _|_.

(.) :: (b -> c) -> (a -> b) -> a -> c
id :: a -> a
therefore b = a
therefore _|_ :: a -> c

(This is mostly rough guesswork, I might be totally wrong)

Joachim
-- 
Joachim Breitner
  e-Mail: mail@joachim-breitner.de
  Homepage: http://www.joachim-breitner.de
  ICQ#: 74513189