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Название: Pseudo-Differential Operators. An Introduction
Автор: Friedrichs K.O.
Pseudo-differential operators, PsDOp, are natural extensions of differential operators, DOp; they have many essential properties in common with DOp, but they do not - in general - have the locality property. An operator L acting on functions u(x) is called "local" if the value of Lu at a point x depends only on the values of the function u in the neighborhood of this point. While PsDOp do not — in general — have this property, they share most other properties with differential operators.