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By careful exploration of separation of variables into the Laplacian inspherical coordinates, we obtain the extra delta-like singularity, eliminationof which restricts the radial wave function at the origin. This constraint hasthe form of boundary condition for the radial Schrodinger equation.

Delta-like singularity in the Reduction of the Laplace Equation for Spherical Coordinates and the Validity of Radial Schrodinger Equation