On Tue, May 8, 2012 03:51, Matthew West wrote:
> doug foxvog wrote: (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 (03)
You are stating in more depth what i tried to say succinctly. I was not
trying to explain 4D philosophy. You explain it well. (04)
-- doug foxvog (05)
> (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".
>
> Regards
>
> Matthew West
> Information Junction
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> (06)
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