observable

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According to the theory of physical observable quantities of the General Theory of Relativity [25-28], the observable properties of a space are the three-dimensional quantities which are invariant within the fixed spatial section of an observer (so-called chronometrically invariant quantities).
2] = 0 while d[sigma] = cd[tau] [not equal to] 0 (where d[tau] is the interval of the physical observable time determined as d[tau] = [square root of [g.
The physical observables used for measuring the non-local effects are simple ones which can be measured with high precisions.

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