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Use this tag for dimensions of a manifold, typically the space-time. DO NOT USE THIS TAG for dimension of a physical quantity nor for the size of an object.
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Can we represent 4D graphically?
One way of looking at dimensionality is the number of points that can be placed equidistantly, minus one. So you can place two points for a line (1D), three points in an equilateral triangle for 2D, a …