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Originally Posted by JohnOwens
No, everything I know/have thought about this would indicate that time and the fourth dimension for the universe wrapping around itself would have to also be mutually perpendicular (in addition to perpendicular to x,y,z of course). I could be wrong, I haven't seen it explicitly mentioned, but I feel fairly confident about this.
P.S. On the other hand, I'm not one of "the professionals", either. :wink:
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Wrapping? I thought of the two as the same dimension, or, that time was, in a way, just one of the symptoms inside the universe of the movement along this dimension, so that when people talk about three space and one time dimension, the time dimension would realy be the movment from the point of the BB singularity(or what ever the universe was created in) along this dimension.
But perhaps you are right. It will be quite some time, if ever, before time and such things are understood, but it can be fun just thinking about it. I guess people have thought about this kind of things as long as there have been thinking people...