Dear Matthew, (01)
The assumption of property instances is orthogonal to the
assumption of a 4-D ontology. (02)
IJ>> I think the solution is to accept the existence of both
>> properties and tropes (property instances). So: two sticks,
>> one property, two property instances, one length value of
>> that property that are instantiated twice. (03)
MW> That of course would not do for a 4 Dimensionalist. There is
> no spatio-temporal extent separate from that which has the
> property that can be the trope. (04)
In other discussions, you have consistently argued for an ontology
that is strictly extensional. That is also an assumption that is
orthogonal to the 3-D vs. 4-D viewpoint. (05)
I sympathize with the desire to minimize the ontological commitment,
but it is important to make each of your assumptions explicit,
rather than claim that they all follow from a single 4-D perspective. (06)
As I have said many times, I don't believe that there is any ideal
ontology that is adequate for all possible purposes. I believe
that both 4-D and 3-D ontologies are equally valid and useful
for various purposes. I would not recommend that either one
be adopted to the exclusion of the other. (07)
Therefore, I prefer to have all assumptions made explicit so that
one can pick and choose which ones to adopt for any application. (08)
John (09)
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