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In Physics Time Is A Coordinate, Not A Dimension.

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Posted by Alexander on October 10, 2001 16:34:54 UTC

And it is important to understand the difference (most don't). The difference is that you can move back and forth in space (in depth, width, etc), but not in time.Time is NOT a degree of freedom. If you doubt - just write down the equation of motion in time (say, velocity or acceleration, etc) - there is NONE.

Anyone who studied physics knows that fact. This is why in SR, GR, QM, QED, field theories, etc, a time coordinate is ALWAYS separated from space coordinates by using imaginary axis. It is mathematical convinience to compactify and simplify long relationships thus to include everything in one equation.

By the way, Kyle, we studied Lorents transforms, proper length and proper time back in high school, so I know them well. You is the one to learn basic physics to see why time travel is impossible.



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