On the structure of Wiener–Hopf operator corresponding to anisotropic boundary value problem, connected with Helmholtz–Schrödinger еquation with the boundary conditions of the first and second type

In this paper we investigate the Fredholm property of Wiener–Hopf operator for anisotropic boundary value problem for the Helmholtz–Schrödinger equation with the boundary conditions of the first and second type on the line $y=0$.