Polynomial and special function theory remains a vibrant area of mathematical research, interweaving classical algebra with advanced analysis. At its core, the study concerns algebraic expressions ...

Todd Dupont, Ridgway Scott, Polynomial Approximation of Functions in Sobolev Spaces, Mathematics of Computation, Vol. 34, No. 150 (Apr., 1980), pp. 441-463 ...

A new procedure for estimating characteristic functions based on a Chebyshev polynomial expansion for the density of the Cosine is developed. Simulation results confirm the usefulness of the method.