2)ABC where k2it/A; (x,y) is the outlet point of the ray from wavefront set x0=const; (x,y) is the point of the ray incidence to the plane of measurement x0=const; S is an eikonal of the wave. As the trajectory of the ray depends on nonhomogeneity itself, then the Eq. (2) relatively n(r) is not of a Radon type, but a nonlinear functional equation. 48
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