| 1. | Beginning in 1718, Thomas Twinin used the Laplacian differential operator.
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| 2. | This is a type of first-order algebraic differential operator.
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| 3. | Suppose \ mathcal { L } is a differential operator such that
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| 4. | Where L _ 1, L _ 2 are differential operators.
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| 5. | The analysis of these problems involves the eigenfunctions of a differential operator.
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| 6. | Their homomorphisms correspond to invariant differential operators over flag manifolds.
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| 7. | The symbol of a differential operator has broad applications to Fourier analysis.
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| 8. | Differential operators are an important class of unbounded operators.
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| 9. | Integrability can often be traced back to the algebraic geometry of differential operators.
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| 10. | A PDE can be expressed as a differential operator applied to a function.
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