L-Splines Generalizations of L-Splines Interpolation and Approximation Results from Piece-Wise Polynomials in Higher Dimensions The Rayleigh-Ritz Galerkin Method for Nonlinear Boundary Value Problems Fourier Analysis Least Squares Methods Eigenvalue Problems Parabolic Problems Chebyshev Semidiscrete Approximations for Linear Parabolic Problems.

