From: John Max Skaller <skaller@ozemail.com.au>
To: caml-list@inria.fr
Subject: Re: [Caml-list] fixpoint
Date: Sun, 04 Aug 2002 15:04:37 +1000 [thread overview]
Message-ID: <3D4CB5E5.7040101@ozemail.com.au> (raw)
In-Reply-To: <3D4C370B.1050201@ozemail.com.au>
John Max Skaller wrote:
Woops:
> which suggests the following reduction:
>
> fix f . fun x . e ==> fix z . e [f x -> z]
>
> Well, the rule works in this case. Will it always work?
>
I meant:
fix f. fun x . e ==> fun x. fix z . e [f x -> z] (* z not occuring
in e *)
ie. the fix and fun binders swap around with the substitution.
I should also have noted that obviously this only works if it is
done at the right time, eg in
fix g. (fun x (fun f ( f x) g) x)
the inner redex must be reduced first.
--
John Max Skaller, mailto:skaller@ozemail.com.au
snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia.
voice:61-2-9660-0850
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prev parent reply other threads:[~2002-08-04 5:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-03 20:03 John Max Skaller
2002-08-04 5:04 ` John Max Skaller [this message]
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