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My take on it is that special relativity provides no evidence that time is an extra dimension (like the spatial dimensions) in anything but a mathematical sense.

General relativity however has quite a lot of effects that mingle together space and time in various ways, so I'm still thinking about that one.




> no evidence that time is an extra dimension (like the spatial dimensions) in anything but a mathematical sense

What do you mean by time being an extra dimension in non-mathematical sense? Dimensions and space are mathematical concepts.


Some people think that time is physically similar to space, e.g. that their is something 'out there', physically existing, which we call space-time.




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