Re: SUO: Re: Ballot Comment
I think it is useful to distinguish between a Point-Object
and a Point-Location. A point-object can have a location
which is a Point-Location. A Point-Object would be an
ancestor of, for example, a fundamental particle that a
physicist wants to model as a point (as they do at times).
In addition, however, it seems useful to allow a point or
region of space to be located in some particular space,
since there may be more than one space. One can also say
that they are part of a space -- but I recall that some
people object to Points being considered as a part of
an interval, for example, whereas regions are
commonly considered as part of a space. Should
points be allowed to be "part" of a space?
Pat Cassidy
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pat hayes wrote:
>
> Pat,
>
> I have no attachment to the second sentence of the documentation string for 'Physical', viz. "Note that points of space and time are themselves understood to have a location in space-time". In fact, as I recall, this was prompted by concerns you had about whether space/time points have a position in space/time.
>
> As I recall, our discussion earlier was about whether it was proper to think of locations as themselves having a location, so it would be natural to apply that to spatiotemporal points having a spatiotemporal position. But the documentation refers to 'points of space and time', which sounds to me to mean something different, ie points of space and points of time. One needs to be a little careful. A point in an k-dimensional subspace of an n-dimensional space, where k < n, is not a point in the larger space: it corresponds to an (n-k)-dimensional manifold of the larger space rather than a point.
>
> If you've decided that you are no longer happy with the sentence, I'll take it out.
>
> Ian, I was never "happy with the sentence", as I never saw it before. But in any case, it's your ontology: YOU say what it should mean. I was just asking for clarification.
>
> Pat
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