quantum mechanical potentials, wave function, Finite element, Rayleigh-Ritz, Galerkin and collocation methods for ordinary differential equations, Particular ordinary differential operators (Dirac, one-dimensional Schrödinger, etc.), eigenvalue, radial Schrödinger equation, Numerical approximation of eigenvalues and of other parts of the spectrum of ordinary differential operators, Numerical solution of eigenvalue problems involving ordinary differential equations, Laguerre pseudospectral methods