From: Hans Aberg <haberg-1@telia.com>
To: Andy Wingo <wingo@pobox.com>
Cc: guile-devel <guile-devel@gnu.org>
Subject: Re: Avoiding variable clashes
Date: Wed, 13 Apr 2011 17:46:46 +0200 [thread overview]
Message-ID: <B877DFED-6391-4AB1-96DD-5BDA7253FDD6@telia.com> (raw)
In-Reply-To: <m339lmgoi6.fsf@unquote.localdomain>
On 13 Apr 2011, at 17:27, Andy Wingo wrote:
>>>> What method is Guile using to avoid substitution variable clashes (de
>>>> Bruijn numbers, combinators, etc.)?
>>>
>>> Each lexical variable is given a fresh name (a gensym) when it is
>>> introduced. The expander keeps an environment as to what name maps to
>>> what gensym, and residualizes the gensym in the lexical reference or
>>> assignment.
>>>
>>> See "The Scheme Compiler" in the manual, for more.
>>
>> I am thinking about it in the context of other types of binders, that
>> satisfies the alpha-rule, but not the beta, useful in math (like theorem
>> provers). Has that been discussed?
>
> Sorry, I don't know what you mean. References?
There is an article here:
http://en.wikipedia.org/wiki/Variable_binding_operator
Hans
next prev parent reply other threads:[~2011-04-13 15:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 12:57 Avoiding variable clashes Hans Aberg
2011-04-13 14:19 ` Andy Wingo
2011-04-13 14:34 ` Hans Aberg
2011-04-13 15:27 ` Andy Wingo
2011-04-13 15:46 ` Hans Aberg [this message]
2011-04-13 16:25 ` Noah Lavine
2011-04-13 16:33 ` Hans Aberg
2011-04-13 16:25 ` Andy Wingo
2011-04-13 16:53 ` Hans Aberg
2011-04-14 1:08 ` Noah Lavine
2011-04-14 7:56 ` Andy Wingo
2011-04-14 13:13 ` Noah Lavine
2011-04-14 14:34 ` Andy Wingo
2011-04-14 8:30 ` Hans Aberg
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