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The Wick calculus of pseudodifferential operators and some of its applications , Cubo Mat. Determinants of pseudodifferential operators and complex deformations of phase space , Methods Appl.
A complete study of the pseudo-spectrum for the rotated harmonic oscillator , J. London Math. Contraction semigroups of elliptic quadratic differential operators , Math.
fckonzenberg.de/components/uberwachung/app-ueberwachung-whatsapp.php Subelliptic estimates for quadratic differential operators , American J. Parametrices for pseudodifferential operators with multiple characteristics , Ark. Function spaces associated to global I-Lagrangian manifolds , Structure of solutions of differential equations , World Sci. Tome 13 , pp.
And do we have the ability, through conscious action and technological savvy, to resist this tide and secure a world where freedom is something which the Internet helps bring about? Pseudo-differential operators : quantization and signals : lectures given at the C. Beside applications in the general theory of partial differential equations, they have their roots also in the study of quantization first envisaged by Hermann Weyl thirty years earlier.
Thanks to the understanding of the connections of wavelets with other branches of mathematical analysis, quantum physics and engineering, such operators have been used under different names as mathematical models in signal analysis since the last decade of the last century. The volume investigates the mathematics of quantization and signals in the context of pseudo-differential operators, Weyl transforms, Daubechies operators, Wick quantization and time-frequency localization operators. Applications to quantization, signal analysis and the modern theory of PDE are highlighted.
Metrics on the phase space and non-selfadjoint pseudo-differential operators by Nicolas Lerner Book 1 edition published in in English and held by 18 WorldCat member libraries worldwide. Furthermore, we show the limits of the above results by counterexamples in Haken cases, insisting on the difficulty to deal with this conjecture.
We are interested in the homogeneous framework in which the solution f t; x; v depends only on the time t and the velocity v. For the study of the Cauchy problem, we consider a uctuation of the solution around the Maxwellian distribution then a decomposition of this uctuation in the spectral base associated to the quantum harmonic oscillator At first, we solve numerically the solutions using symbolic computation methods and spectral decomposition of Hermite functions.
We consider regular initial data and initial conditions of distribution type. Next, we prove that there is no longer a global solution in time for a large initial condition that changes sign which does not contradict the global existence of a weak solution for a positive initial condition - see for example Villani Arch.
Metrics on the Phase Space and Non-Selfadjoint Pseudo-Differential Operators. Authors: Lerner, Nicolas. Free Preview. A thorough exposition of. Non-Selfadjoint Pseudodifferential Operators. Nicolas Lerner .. given by a metric on the phase space and also for many helpful indications on.
Rational Mech. Anal Uniqueness of continuous solutions for BV vector fields by F Colombini Book 1 edition published in in English and held by 1 WorldCat member library worldwide. Trace theorems for pseudo-differential operators by Nicolas Lerner 1 edition published in in English and held by 1 WorldCat member library worldwide. The proof is based on the construction of a family of exact solutions which exhib an exponential growth, both in time and frequency.
We prove analogous results for some cases of transition from hyperbolicity to ellipticity, with a potential restriction on the Gevrey index for which we may observe the instability. In a second time, we consider weakly hyperbolic systems. Thanks to an energy estimate in Gevrey spaces and the construction of a suitable symetriser, we prove local well-posedness for such a system. In doing so we use and prove a result on actions of pseudo-differential operators whose symbols have Gevrey regularity in the spatial variable.