Fourier analysis 56 Fourier and harmonic analysis 23 Wavelets (Mathematics) 12 Mathematics 10 Differential equations, Partial 8 Fourier transformations 6 Approximation theory 4 Boundary value problems 3 Fourier Analysis 3 Harmonic analysis 3 Mathematical analysis 3 Annals of Mathematics Studies 2 Differential equations 2 Finite groups 2 Functions 2 Functions of several complex variables 2 MATHEMATICS / Number Theory 2 Mathematical models 2 Mathematical physics 2 Measure theory 2 Nanoelectronics 2 Nanophotonics 2 Number theory 2 Numerical analysis 2 Pseudodifferential operators 2 Signal processing 2 Algebra 1 Algebraische Geometrie 1 Algorithms, Mathematics, Fourier Analysis 1 Analysis 1