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RE: Time?
It probably depends on how you define a dimension.
Time can certainly enter into equations just like spatial dimensions. To me time seems to be unique in only one aspect, it is incredibly difficult to travel through time except in the "preferred" direction if you have mass. And if you are massless, the best you can do is to stay in one place (in time). (In fact that might be all you can do.)
At this juncture I don't think it's fair to involve tacyons because they are purely hypothetical and their use in theories usually results in inconsistencies. I'm only aware of one purported detection and it has not been reproduced. Of course if they did exist, that would mean travel in time could be bidirectional, which, I think, would support the idea of time as a dimension.
Define dimension, and let the fun begin.
So what is a dimension?
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