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Re: [ontology-summit] First Model Bench Challenge

To: <doug@xxxxxxxxxx>, "'Ontology Summit 2012 discussion'" <ontology-summit@xxxxxxxxxxxxxxxx>
From: "Matthew West" <dr.matthew.west@xxxxxxxxx>
Date: Tue, 8 May 2012 08:51:24 +0100
Message-id: <4fa8d07f.6303b40a.7fa8.51d6@xxxxxxxxxxxxx>
Dear Doug,    (01)

> A class such as Person, Planet, or Country arguably also has different
> members at different times.  However, some philosophers (especially
> four-dimensionalists) would claim that the membership of such classes
> does not change, merely the state of existence of its members change.    (02)

MW: That's not quite right. Actually, the argument is that because
individuals are spatio-temporal extents, you view them from outside time,
and that is why the membership of classes like Person does not change (which
strictly would only contain the set of whole-life Persons, otherwise you do
not get the right count, which would be of all persons who ever have, and
ever will exist). The spatio-temporal extents are considered to exist
simpliciter independent of time. You can of course also have the class
"Persons alive at 2012-05-08 21:52:00".    (03)

Regards    (04)

Matthew West                            
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Tel: +44 1489 880185
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http://www.matthew-west.org.uk/    (05)

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