BASES DE RIESZ 3 BASES ORTONORMALES 3 ESPACIOS DE PALEY-WIENER 3 ESPACIOS INVARIANTES POR TRASLACIONES ENTERAS 3 EXTRA INVARIANCE 3 EXTRA INVARIANCIA 3 FRAMES 3 MARCOS 3 MUESTREO 3 ORTHONORMAL BASES 3 PALEY-WIENER SPACES 3 RIESZ BASES 3 SAMPLING 3 SHIFT-INVARIANT SPACES 3 Approximation problems 2 Closed subspace 2 Extra-invariance 2 Frames of exponentials 2 Functional analysis 2 Harmonic analysis 2 Multi-tiling 2 Paley-wiener spaces 2 Paley–Wiener spaces 2 Parseval frames 2 Primary 2 Riesz bases of exponentials 2 Sampling 2 Secondary 2 Shift invariant spaces 2 Shift-invariant space 2