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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