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Re: [ontolog-forum] Fwd: Ontologies and individuals

from [Alexander Titov] [Permanent Link][Original]
To: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Alexander Titov <av_titov@xxxxxxxxx>
Date: 2012年12月18日 13:28:21 +0000
Message-id: <50D06F75.9070409@xxxxxxxxx>
Dear Matthew,

I would like to ask a few questions to understand you better:

[MW: Someone mentioned that an individual is something that does not have members (in the sense of a set having members) and that is close to what I would mean, but that would make the null set an individual, so it is not quite adequate. My definition of individual is something that exists in space and time. I am not a set (or class or type or kind or sort etc) nor is my car or this email. Nor is Sherlock Holmes to give a more difficult example. All these things can be placed in space and time (even if it is imaginary space and time) . On the other hand, sets/classes/types are generally considered to exist outside space and time.
I understand that a 'main dichotomy' between an individual and a set/class/type is - existence in space and time (rather than having or not having members).

MW: On the other hand, sets/classes/types are generally considered to exist outside space and time.  

Can we consider opposite - sets/classes/types do exist within space and time as well? For example, as a collection/set of space and time extensions of all their members?

What will happen if the criteria is joined: 'does not have members' and 'exists in space and time'? Not sure if it is better... We have now another (at least three) cases to think about...

Regards,
Alex

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