Dear John, (01)
This is a problem for 3Dists (02)
> 4. Therefore, any use of set theory for representing physical
> entities
> must recognize that a set at one instant of time is not
> "exactly
> the same" set of supposedly "exactly the same" things at any
> other instant. (03)
However, 4D neatly sidesteps this with states/stages/temporal parts. The
temporal part is unchanging and always a member of the sets it is a
member of. This is why 4D and set theory fit well together. (04)
Regards (05)
Matthew West
Information Junction
Tel: +44 560 302 3685
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matthew.west@xxxxxxxxxxxxxxxxxxxxxxxxx
http://www.informationjunction.co.uk/
http://www.matthew-west.org.uk/ (06)
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