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From: David BL <davidbl@iinet.net.au>
Newsgroups: comp.databases.theory
Subject: Re: Entity and Identity
Date: Sun, 26 Jul 2009 17:25:40 -0700 (PDT)
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On Jul 26, 3:56 pm, Brian <br...@selzer-software.com> wrote:
> On Jul 26, 2:10 am, David BL <davi...@iinet.net.au> wrote:
>
> > On Jul 26, 12:23 pm, Brian <br...@selzer-software.com> wrote:
>
> > > Are you saying that the domain of discourse cannot consist of both
> > > mathematical constructs and physical entities?
>
> > What do you mean by the domain of discourse (in a discussion about
> > state machines)?
>
> The purpose of state machines is to model behavior exhibited by
> concrete objects--that is, things that can have a location in time or
> space.  I should think that in order to model the behavior of concrete
> objects, one must first be able to discuss them.

That depends on what you mean exactly.  For example, OO source code
listings don't refer to the computers on which they execute (never
mind particular objects).