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In constructive solid geometry, holes are frequently
constructed by subtracting one solid for another (drilling a hole is equivalent
to subtracting a cylinder). Consequently, to move a hole, we need to have kept
track of the subtracted solid and to move it. That is, the hole is not the
accidental absence of matter, but the deliberate presence of "antimatter".
Similarly, in discussing NC controlled drilling, we keep
track of holes and patterns of holes, rather than try to describe only the
substrate and hope the machine thereby guesses which absences it should be
responsible for. In mould making, the objective is to make a hole the shape of
the part we are making. In making bottle, we are asked to design a hole of a
particular volume.
One might observe that doorways are just holes in walls, a
street is just a hole between buildings, an a parking space is just a hole in a
row of cars, an appointment is hole in my calendar where I want to keep other
things from filling the vacuum. If I can't have different sorts of holes in my
ontology, I'll be in trouble.
Sean Barker
Bristol, UK
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| Thanks a lot all for
reiteratioms (got the point thanks)
somehow however I am still not
convinced that a hole is 'something' in the same way (or equivalent) to
what's around it. surely what's around a hole is of a different nature from
the hole itself, so it would not be correct to say to define them in the same
way
but I accept that you may want to define it by virtue of whats
around it
(if thats the only thing you can do).
I am not ready to
argue this sensibly, sorry - just will keep on observing (hole
staring) and will report back when I see something there
thanks
PDM
On 9/20/07, Jack
Teller <drjackteller@xxxxxxxxxxx>
wrote:
A
"hole" is a "something" that requires another "something" in
its
definition of existence, as in: "There's a _hole_ in the _bucket_,
dear
Liza..."
Jack
Peter F Brown wrote:
>
> A
hole is not the same as a "nothing" – there are two separate threads
>
in this discussion: are we not talking about two different "things"
(I
> use the word advisedly and very cautiously)?
>
>
Peter B
>
> *From:* ontolog-forum-bounces@xxxxxxxxxxxxxxxx
>
[mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx
] *On Behalf Of *Deborah
> MacPherson
> *Sent:* 18 September
2007 20:01
> *To:* [ontolog-forum]
> *Subject:* Re:
[ontolog-forum] entity: nothing
>
> Hi Paola -
>
>
The Cage analogy came around to silence being able to be bounded by
>
sound. Carved sculptures take away unwanted material until only the
>
essential parts remain. In museum design certain content is not
ready
> to be named but it can be classified, subject areas yet to be
defined
> are left as blank, un-labeled placeholders allocating
space, hoping
> future requirements will fit without rearranging
everything again.
>
> More to your point surely is John's
statement "more like a boundary
> than pure nothingness". So with the
stretched metaphors above.....What
> do you think needs to be bounded?
What are opposite each other inside
> and outside the boundaries? What
could possibly be consistent across a
> range of ontologies? What
existing communication system like OWL, or
> ___, or ___, or ___ is
best suited to indicating a boundary? How do
> you know when you
encounter a boundary? Simply won't process? How do
> you "see" the
holes and can you measure how big or small they are?
>
>
Deborah
>
> On 9/18/07, *paola.dimaio@xxxxxxxxx
<mailto:
paola.dimaio@xxxxxxxxx>*
> <paola.dimaio@xxxxxxxxx
<mailto:paola.dimaio@xxxxxxxxx>>
wrote:
>
> I am not entirely sure that we have not yet answered
this, I may have
> missed somethin
>
> Following the
discussion on holes, the one questrion that I am left
> with is
whether
> holes are entities as such, or non entities
and
>
> if so
> whether they would belong to a ' class of
nothing' being
> proposed/discussed somewhere earlier on this
forum
>
> It looks to me that they are non entity cause they
dont have a mass
> that can be measured
> I mean an entity is
determined by its attributes and properties while
> the only property
of a hole that we can say is 'absence of energy'
>
> This is an
attempt to bring the hole discussion into the focus of
> current
ontological question
>
> apologies if this is trivial
>
>
> --
> Paola Di Maio
> School of
IT
> www.mfu.ac.th <http://www.mfu.ac.th>
>
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School of IT
www.mfu.ac.th
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