Compactness is established for pseudo-differential operators whose symbols lie in the refined modulation space M^{sharp,q} (0 < q ≤ 1) when acting on a broad family of modulation spaces.
TranquilliGlobal normal forms and global properties in function spaces for second order Shubin type operatorsPhD
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Compactness for pseudo-differential and Toeplitz operators on modulation spaces
Compactness is established for pseudo-differential operators whose symbols lie in the refined modulation space M^{sharp,q} (0 < q ≤ 1) when acting on a broad family of modulation spaces.