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Re: [ontolog-forum] Presentism (was Re: Ontology of Rough Sets)

To: ontolog-forum@xxxxxxxxxxxxxxxx
From: "John F. Sowa" <sowa@xxxxxxxxxxx>
Date: Thu, 27 Jan 2011 07:31:12 -0500
Message-id: <4D416590.9030403@xxxxxxxxxxx>
Dear Matthew,    (01)

The implementation issue of whether you throw away old data is
not a fundamental characteristic of a 3+1 D system.    (02)

> 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.    (03)

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.    (04)

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.    (05)

John    (06)

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