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Surely a zero size dimension cannot exist and is therefore irrelevant and does not need to be included in the model.It's a bit like talking about a function for which all its differential coefficients are zero. If this is true the value of this function can never change.
LeeE; Yes you did, both directly and by implication re-reead carefully and revise your contribution if you wish. I also see no immediate need to leap straight to an infinite number of dimensions in a universe once you go above four.