It appears in Einstein's Field Equations and presumably allows us to calculate the Metric of spacetime, which is a bilinear map from a pair of spacetime coordinates to a real number. If the foregoing is correct, what is the definition of distance between any pair of spacetime points, and does it depend, as I think it does, on the energy distribution of the type of spacetime under consideration? That is, is it the free fall path length between any two spacetime points, or if not, then what? TY, AG

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