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Re: [ontolog-forum] Logic, Datalog and SQL

To: Christopher Menzel <cmenzel@xxxxxxxx>
Cc: "[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Pat Hayes <phayes@xxxxxxx>
Date: Fri, 9 Feb 2007 13:49:18 -0600
Message-id: <p06230905c1f27e4f9c07@[]>
>On Feb 9, 2007, at 12:26 PM, Pat Hayes wrote:
>>  ...I think (as I said in
>>  an email response a few days ago) that the usages
>>  of "model" in "model theory" and "modelling"
>>  (respectively realization and prototype) are at
>>  best unrelated, and at worst almost directly
>>  opposite in meaning.
>I guess I don't see that, Pat.  Don't, say, a physical model of a 
>Boeing 777 and my Tarskian model of the faculty and administration at 
>Texas A&M both represent (hence, in some sense, "model") relevant 
>structural features of complex real-world things?    (01)

Well, you can put it that way, as John prefers, 
but I think its misleading. Why isn't your 
Tarskian model actually part of the (real) 
faculty and administration at TAMU? Or perhaps 
better, why could it not be?    (02)

The oppositeness happens when we speak not of a 
physical model of the plane, but a symbolic model 
in a computer, which amounts to a large 
complicated description of the plane. Which way 
does the modelling relationship go now? This is a 
simulation-model of the real physical plane 
because it *describes* that plane accurately, 
i.e. because the real physical plane is a 
Tarski-realization-model of it. The 'model of' 
arrows in this picture are now pointing in 
opposite directions; in fact, they are at 
opposite ends of the very same arc.    (03)

Pat    (04)

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