[Haskell-cafe] about beta NF in lambda calculus

[Eugene Kirpichov]

Actually I was also going to provide exactly the same example, but
hesitated to :)

2009/3/21 Antti-Juhani Kaijanaho <antti-juhani at kaijanaho.fi>:
> On Sat, Mar 21, 2009 at 07:29:05PM +0000, Algebras Math wrote:
>> If above is true, I am confused why we have to distinguish the terms which
>> have NF and be in NF? isn't the terms have NF will eventually become in NF?
>> or there are some way to avoid them becoming in NF?
>
> Spoken like a mathematician :)  (Well, only sort of.)
>
> The way to avoid it is not to perform the work of beta conversion.
> Similarly, you may say that people are either dead or will eventually die, so
> why distinguish between a person who is dead and a mortal, live person?
>
> --
> Antti-Juhani Kaijanaho, Jyväskylä, Finland
> http://antti-juhani.kaijanaho.fi/newblog/
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-- 
Eugene Kirpichov
Web IR developer, market.yandex.ru