Fourier and harmonic analysis 130 Harmonic analysis 43 Mathematics 10 Functional analysis 6 Mathematical analysis 5 Approximation theory 4 Fourier analysis 4 Operator theory 4 Signal processing 4 Bases (Linear topological spaces) 3 Fourier transformations 3 Frames (Vector analysis) 3 Functions of complex variables 3 Harmonic analysis on Euclidean spaces 3 Lecture Notes in Mathematics 3 Numerical analysis 3 Series, Infinite 3 Annals of Mathematics Studies 2 Approximations and expansions 2 Banach algebras 2 Differential equations, Partial 2 Engineering mathematics 2 Fourier series 2 Functions of a complex variable 2 Generalized spaces 2 Harmonic Analysis 2 Locally compact Abelian groups 2 Mathematical physics 2 Number theory 2 Probability theory and stochastic processes 2