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Published online by Cambridge University Press: 07 February 2017
The knowledge of the geodetic interval between two points in a Riemannian space-time with the metric gab is essential for statements on the time delay in a gravitational field represented by gab and makes possible to derive explicit criteria for clear-cut wave propagation. The nonlinear differential equation for the geodetic interval is integrated via perturbation expansion in the second post-Minkowskian approximation.