From: John Max Skaller <skaller@ozemail.com.au>
To: Michael Vanier <mvanier@cs.caltech.edu>
Cc: wlovas@stwing.upenn.edu, caml-list@inria.fr
Subject: Re: [Caml-list] yet another question on lazy lists
Date: Mon, 08 Jul 2002 10:33:53 +1000 [thread overview]
Message-ID: <3D28DDF1.2070002@ozemail.com.au> (raw)
In-Reply-To: <200207070026.g670Qdq14166@orchestra.cs.caltech.edu>
>
>
>
>Right again. This is SICP terminology. I'll change it if I post any more
>questions on this subject to this list.
>
My understanding is that a list is a finite inductuive type,
characterised by constructors.
Whereas a stream is like an infinite list, but it is a coinductive type,
characterised by destructors:
'a list = Empty | Cons of 'a * 'a list
split ('a stream) -> 'a * 'a stream
As I understand it, the two types are formally dual.
See Charity (if you can find it) for a language which provides
coinductive types with a natural syntax which makes the duality
syntactically evident.
--
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:[~2002-07-08 0:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-06 1:48 Michael Vanier
2002-07-06 15:26 ` Pierre Weis
2002-07-06 18:22 ` William Lovas
2002-07-07 0:26 ` Michael Vanier
2002-07-08 0:33 ` John Max Skaller [this message]
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