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Re: [ontolog-forum] Ontological Assumptions of FOL

To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Ingvar Johansson <ingvar.johansson@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Mar 2007 10:24:14 +0100
Message-id: <45FE56BE.1060105@xxxxxxxxxxxxxxxxxxxxxx>
Chris Partridge schrieb:
> Ingvar,
> In many philosophical contexts it is important to keep *sets* (abstract 
> non-temporal entities)
> [Chris Partridge] I believe David Lewis (In Plurarity of Worlds) rails
> against this interpretation. He sees sets (especially small finite sets
> whose members are not scattered) as clearly concrete, with an obvious
> spatio-temporal location. Can I put that on people's reading lists :-).
>  whose members are spatiotemporal entities 
> distinct from the *aggregate* (Mario Bunge) or the *collection* (Peter 
> Simons) of the same spatiotemporal entities.     (01)

Yes, please, put it on the reading list! This would make it clear that 
as soon as the distinction between 'abstract non-temporal entities' 
(sets, numbers, universals, propositions, etc.) and 'concrete 
spatiotemporal entities' (you, me, the things around us, molecules, 
etc.) is accepted, a philosophical-ontological problem arises: does it 
nonetheless make sense (and can it even be true) to say that abstract 
entities exist only in space and time? My positive answers can be found 
in my paper "Roman Ingarden and the Problem of Universals", but (being a 
newcomer here) I have got the impression that such discussions are far 
beyond what this forum has been created for.    (02)

Best wishes,
Ingvar    (03)

Ingvar Johansson
IFOMIS, Saarland University
     home site: http://ifomis.org/
     personal home site:
     http://hem.passagen.se/ijohansson/index.html      (04)

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