We need to time-index the part-of relation for continuants (e.g.
objects), because the latter can have different parts at different
times. 'This molecule is part of Michael West's nose' is not
determinately true or false; it becomes determinately true or false
when we add a time-index to the whole assertion. (01)
There is nothing analogous in the realm of properties: 'This missile
movement is part of the Second World War' is determinately true, or
false, independently of when it is asserted. (02)
BS (03)
At 05:03 PM 1/23/2006, you wrote: (04)
>Some comments below concerning the discussion about parts of objects,
>processes, etc.
>
>Original comments below by Barry Smith:
>-----ontac-dev-bounces@xxxxxxxxxxxxxx wrote: -----
> >The details are supplied in full in:
> >
> > http://ontology.buffalo.edu/smith/articles/SNAP_SPAN.pdf
> >
> >Basically, all instance-level x part_of y
> >assertions for 3D objects are indexed by times.
> >This is not necessary for 4D objects, since
> >processes do not gain and lose parts over time.
>
>My comment here, is concerning processes. I can envision a 4D object
>(process) having component parts (sub-processes?). In that case, should we
>not also concerning indexing x part_of y (where y is a process) also by
>time? The alternative seems to suggest that all processes (and
>sub-processes) are without time boundary.
>
>Chuck Turnitsa
>
>
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