[Top] [All Lists]

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

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Christopher Menzel <cmenzel@xxxxxxxx>
Date: Fri, 9 Feb 2007 14:13:25 -0600
Message-id: <E1C85E95-4CC0-4539-A64E-5C637BC5F666@xxxxxxxx>
>> 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?
> 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?    (01)

Well, it *is* a set, and (extentions of) the properties of and  
relations among the elements of the domain are just sets of n- 
tuples.  I don't see how those are in any robust sense *part* of  
TAMU.  Furthermore, I might choose to represent faculty members by,  
say, their University ID numbers in my model; even still, the model  
is a representation of the indended structure.    (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)

Point taken.    (04)

-chris    (05)

Message Archives: http://ontolog.cim3.net/forum/ontolog-forum/  
Subscribe/Config: http://ontolog.cim3.net/mailman/listinfo/ontolog-forum/  
Unsubscribe: mailto:ontolog-forum-leave@xxxxxxxxxxxxxxxx
Shared Files: http://ontolog.cim3.net/file/
Community Wiki: http://ontolog.cim3.net/wiki/ 
To Post: mailto:ontolog-forum@xxxxxxxxxxxxxxxx    (06)

<Prev in Thread] Current Thread [Next in Thread>