Density in approximation theory.
Density methods and results in approximation theory
Approximation theory and functional analysis share many common problems and points of contact. One of the areas of mutual interest is that of density results. In this paper we briefly survey various methods and results in this area starting from work of Weierstrass and Riesz, and extending to more recent times.
Discrete, Nonlinear Approximation Problems in Polyhedral Norms.
Discrete, Nonlinear Approximation Problems in Polyhedral Norms. A Levenberg-Like Algorithm.