Symbolic Calculus and Fredholm Property for Localization Operators
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We study the composition of time-frequency localization operators (wavepacket operators) and develop a symbolic calculus of such operators on modulation spaces. The use of time-frequency methods (phase space methods) allows the use of rough symbols of ultra-rapid growth in place of smooth symbols in the standard classes. As the main application it is shown that, in general, a localization operator possesses the Fredholm property, and thus its range is closed in the target space.
- Symbolic Calculus and Fredholm Property for Localization Operators
Journal of Fourier Analysis and Applications
Volume 12, Issue 4 , pp 371-392
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