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math.CA2009
A vectorial Ingham-Beurling theorem
Alia Barhoumi, Vilmos Komornik, Michel Mehrenberger
Baiocchi et al. generalized a few years ago a classical theorem of Ingham and Beurling by means of divided differences. The optimality of their assumption has been proven by the th…
math.CA2008
Explicit multidimensional Ingham--Beurling type estimates
Vilmos Komornik
Recently a new proof was given for Beurling's Ingham type theorem on one-dimensional nonharmonic Fourier series, providing explicit constants. We improve this result by applying a…