[TopQuark]

Time is rather iffy as it is subject to the "red-shift" of Einsteinian relativity. I beg to disagree: there is nothing "iffy" about time. The red shift refers to measurement of frequency of light, not time.

I will admit that in theory, at least, you can have unlimited dimensions (otherwise, why calculus?). The calculus to which you refer is useful even in one dimension. It’s full name is the Calculus of Infinitesimals, reminding us that it really does not address the dimensionality. There are, of course, other calculi, such as vector and tensor ones, for which the dimensionality is of the essence.

[Frumious Bandersnatch]

By the red shift affect, I was referring to the theory of relativity which indicates that time is relative to where you are.  As such, a person approaching the speed of light might actually arrive at the middle of the galaxy in a matter of days or weeks while whole civilizations had risen and fallen on earth during his voyage.

[habs4ever]

Oh boy, oh no...more things to consider as the day approaches.Palo, anything about this now?? LOL