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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