Approximation theory Numerical analysis 6 Mathematics 5 Functional analysis 4 Mathematical optimization 4 Asymptotic expansions 3 Computer algorithms 3 Fourier analysis 3 Functions of complex variables 3 Multivariate analysis 3 Numerical solutions 3 Polynomials 3 Approximations and expansions 2 Calculus 2 Computational complexity 2 Computer science 2 Congresses 2 Data processing 2 Differential equations 2 Functions 2 Functions of a complex variable 2 Harmonic analysis on Euclidean spaces 2 Information theory 2 Linear operators 2 Mathematical models 2 Number theory 2 Operator theory 2 Probability theory and stochastic processes 2 Real functions 2 Spline theory 2