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real numbers could be seen as almost a subset of imaginary numbers. the "i" part can just be seen as a rotation of 90 degrees off the real axis. and then youve got 3D imaginary numbers with i,j, and k called Quaternions, but if you include real numbers in that then you have 4D. just try and picture in your head a 4D cube. its impossible to picture but the mathematics makes it possible. then go even higher
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