+1 Thank you Ian. (01)
-----Original Message-----
From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
[mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ian Bailey
Sent: Thursday, January 27, 2011 9:18 AM
To: '[ontolog-forum] '
Subject: [ontolog-forum] 3D+1 (was presentism...was blah blah blah) (02)
Hello, (03)
Can someone please explain (in monkey terms, for I am a monkey-brain) what
3D+1 actually is ? I get 4D, finally, after years of hanging on Chris and
Matthew's coattails, but the 3D+1 thing is a mystery. I have good reason to
ask, as I once had a 4D ontology pilot project rejected because the customer
believed their 3D+1 approach was more than adequate. When pushed, it turned
out they had no idea what 3D+1 was either. I googled it at the time and got
nothing back of any use. (04)
It would help if whoever answers this could provide some real examples. (05)
Also, does it work ? ...and by that I don't mean is it logically complete,
compliant with FOL, etc. I mean has it ever solved anyone's business
problems ? (06)
Thanks (07)
Ian (08)
-----Original Message-----
From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx
[mailto:ontolog-forum-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Matthew West
Sent: 27 January 2011 13:50
To: '[ontolog-forum] '
Subject: Re: [ontolog-forum] Presentism (was Re: Ontology of Rough Sets) (09)
Dear John, (010)
I agree that generally 3+1D can be converted to 4D. However, Presentism is
not even 3+1D. (011)
Regards (012)
Matthew West
Information Junction
Tel: +44 560 302 3685
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Skype: dr.matthew.west
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http://www.matthew-west.org.uk/ (013)
This email originates from Information Junction Ltd. Registered in England
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Registered office: 2 Brookside, Meadow Way, Letchworth Garden City,
Hertfordshire, SG6 3JE. (014)
>
> The implementation issue of whether you throw away old data is
> not a fundamental characteristic of a 3+1 D system.
>
> > They only held a "current state" view of the world, so if a car was red
> > and then painted blue, the colour attribute was changed from red to
> > blue, and you had no way of knowing it was once red.
>
> Please remember that the early disk systems had a grand total of 5MB
> of data. Previous states were usually saved on tape (or even punched
> cards -- 1 box of cards can store 800KB). But the software had to
> evolve quite a bit to support a smooth reconstruction of an
> earlier state.
>
> I agree that a 4D ontology simplifies many operations, but it's
> important to recognize that a systematic representation of 3+1 D
> can be converted to and from a 4D version.
>
> John
>
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