Dear John, (01)
I agree that generally 3+1D can be converted to 4D. However, Presentism is
not even 3+1D. (02)
Regards (03)
Matthew West
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>
> 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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