Pseudo-differential Operators with Double Characteristics.
Pseudodifferential operators with generalized symbols and regularity theory.
Pseudodifferential operators with multiple characteristics and Gevrey classes
Pseudo-differential operators with positive symbols
Pseudo-differential operators with symbols admitting negative values
Pseudodifferential parametrices of infinite order for SG-hyperbolic problems.
Pseudodifferenziali definiti su aperti di una cosfera fibrata
Pseudo-spectrum for a class of semi-classical operators
We study in this paper a notion of pseudo-spectrum in the semi-classical setting called injectivity pseudo-spectrum. The injectivity pseudo-spectrum is a subset of points in the complex plane where there exist some quasi-modes with a precise rate of decay. For that reason, these values can be considered as some ‘almost eigenvalues’ in the semi-classical limit. We are interested here in studying the absence of injectivity pseudo-spectrum, which is characterized by a global a priori estimate. We prove...
Pseudospectrum for differential operators