 Quote by Passionflower
I know some disagree but I think that time is a path in spacetime not a dimension of spacetime.
One can choose a coordinate system as such that the path in spacetime overlaps one axis (which we then call time) but such a coordinate would only be valid for user at rest to this coordinate system in flat spacetime. In curved spacetime even that is no longer true.
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You may be on to something, Passionflower. Could you expand on that idea a little? For example, what is the 4th dimension then, if it is not always time? And is it different in curved spacetime?