Re: What is analysis?

From: paul c <>
Date: Thu, 06 Dec 2007 15:53:47 GMT
Message-ID: <fWU5j.2544$iU.1774_at_pd7urf2no>

David Cressey wrote:

> "Jon Heggland" <> wrote in message
> news:fj641f$m36$

>> Bob Badour answered this; I'll just add a quote from Date's Introduction
>> to Database Systems (2004):
>> In his [1970] paper, Codd uses the term /time-varying relations/ in
>> place of our preferred /relation variables/ (relvars). But /time-varying
>> relations/ is not really a very good term. First, relations as such are
>> /values/ and simply do not "vary with time" (there is no notion in
>> mathematics of a relation having different values at different times).
>> Second, if we say in some programming language, for example, DECLARE N
>> INTEGER ; we do not call N a "time-varying integer", we call it an
>> /integer variable/.
>> (End quote)
> Thanks for the above  I'm going to try to incorporate "relvar" into my
> vocabulary,  at the expense of misusing it several times in public.  Be
> forgiving, while correcting me.
> ...

Date gives a rationale for the term at: Received on Thu Dec 06 2007 - 16:53:47 CET

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