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Skada - I have a hard time comprehending 4D but I'm trying. If I travel straight in space and come back to the same point, it seems to me that all I would have done is define the finite "surface" of that space. I've proven that space is finite, but I haven't proven that the universe is finite. Because, the universe would have to encompass even that which lays outside the surface of that space.
I realize that you're not wrong and I'm not trying to be right. Maybe we're working from different definitions of "universe".
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