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Uniformly bounded orthonormal polynomials on the sphere 
Marzo Sánchez, Jordi; Ortega Cerdà, Joaquim
Universitat de Barcelona
We introduce a new notion for the deformation of Gabor systems. Such deformations are in general nonlinear and, in particular, include the standard jitter error and linear deformations of phase space. With this new notion we prove a strong deformation result for Gabor frames and Gabor Riesz sequences that covers the known perturbation and deformation results. Our proof of the deformation theorem requires a new characterization of Gabor frames and Gabor Riesz sequences. It is in the style of Beurling's characterization of sets of sampling for bandlimited functions and extends significantly the known characterization of Gabor frames 'without inequalities' from lattices to non-uniform sets.
Funcions holomorfes
Funcions de diverses variables complexes
Espais fibrats (Matemàtica)
Holomorphic functions
Functions of several complex variables
Fiber spaces (Mathematics)
(c) London Mathematical Society, 2015
London Mathematical Society

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