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On a theorem of Ingham |
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| Authors: | Stéphane Jaffard Marius Tucsnak Enrique Zuazua |
| Institution: | (1) Département de Mathémathiques, Universitié Paris XII, France;(2) CMAP, Ecole Polytechnique and Université de Versailles, France;(3) Departamento de Matemática Aplicada, Universidad Complutense, Madrid, Spain;(4) CMLA, ENS Cachan, France |
| Abstract: | We prove a trigonometric inequality of Ingham’s type for nonharmonic Fourier series when the gap condition between frequencies does not hold any more. Partially supported by grants PB93-1203 of the DGICYT (Spain) and CHRX-CT94-04771 of the UE. |
| Keywords: | 42A63 42A75 49J20 |
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