Abram Demski wrote:
> Thomas,
> If time is merely an additional space dimension, why do we experience
> "moving" in it always and only in one direction? Why do we remember
> the past and not the future? Could a being move in some spatial
> dimension in the same way we move through time, and in doing so treat
> time more like we treat space? Et cetera.
> To my knowledge, modern physics treats many things as "dimensions":
> not just time and space, but also forces such as electromagnetism.
> This does not imply that such things are spatial in nature. A
> dimension is just a variable. Unless you think there is something
> particularly spatial about time?

There is something spatial about time, duration is measured along paths in 
space.  Coordinate time is mixed with space by Lorentz symmetries.  But it's 
still different from space.  Lee Smolin and Fotini Markopolo have argued that 
time must be considered fundamental (no block universe).


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