\begin{abstract} We describe the essential spectrum of a hypoelliptic pseudo-differential operator which is the sum of a constant-coefficients operator and an operator with coefficients vanishing at infinity. \end{abstract}
On the Essential Spectrum of Hypoelliptic Pseudo-differential Operators
BUZANO, Ernesto;
2008-01-01
Abstract
\begin{abstract} We describe the essential spectrum of a hypoelliptic pseudo-differential operator which is the sum of a constant-coefficients operator and an operator with coefficients vanishing at infinity. \end{abstract}
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