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In the theory of partial differential equations, elliptic operators are differential operators that generalize the Laplace operator. They are defined by the condition that the coefficients of the highest-order derivatives be positive, which implies the key property that the principal symbol is invertible, or equivalently that there are no real characteristic directions.Elliptic operators are typical of potential theory, and they appear frequently in electrostatics and continuum mechanics.

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  • In the theory of partial differential equations, elliptic operators are differential operators that generalize the Laplace operator. They are defined by the condition that the coefficients of the highest-order derivatives be positive, which implies the key property that the principal symbol is invertible, or equivalently that there are no real characteristic directions.Elliptic operators are typical of potential theory, and they appear frequently in electrostatics and continuum mechanics.
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