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Re: [ontolog-forum] Ontology of Rough Sets

To: "'[ontolog-forum] '" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: "Matthew West" <dr.matthew.west@xxxxxxxxx>
Date: Sun, 23 Jan 2011 11:10:18 -0000
Message-id: <4d3c0c9b.122ae30a.3a86.ffff80f4@xxxxxxxxxxxxx>
Dear Pat,    (01)

This could be misinterpreted.    (02)

> > A 4D object, in this context, is an object that can have different
> > state at different times.
> No, that is a continuant. In a very strict 4D model, there is no single
> 'thing' that has the various states. (Although I hasten to add, it is very
> convenient to be somewhat less strict than this. I mean only to make the
> conceptual distinction.)    (03)

MW: As you know, there are two versions of 4D, one of which, stage theory,
only admits timeslices with infinitesimal temporal thickness called stages
which can be strung together, the other, perdurantism, allows objects to be
extended in time as well as space, and that one spatio-temporal extent can
be a part of another.    (04)

MW: The ambiguity comes from "there is no single 'thing' that has the
various states".    (05)

MW: This is true if one is talking about stage theory - there are only the
various stages. However, it is not true for perdurantism, provided one
interprets "has" as meaning "has temporal parts".    (06)

Regards    (07)

Matthew West                            
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Tel: +44 560 302 3685
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http://www.matthew-west.org.uk/    (08)

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