| 21. | The Laplacian differential operator, widely used in mathematics, is also named after him.
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| 22. | General differential operators include higher order derivatives.
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| 23. | :Is D an arbitrary differential operator?
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| 24. | The SU ( 3 ) generators were expressed as differential operators in four independent variables.
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| 25. | In mathematics, a "'differential operator "'is an differentiation operator.
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| 26. | Let D be a ( possibly nonlinear ) differential operator between vector bundles of any rank.
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| 27. | Atiyah and Singer thanked H�rmander for assistance with understanding the theory of Pseudo-differential operators.
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| 28. | He has made notable contributions to the study of partial differential equations and partial differential operators.
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| 29. | :It is a differential operator.
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| 30. | Let } } be the imaginary unit and let " denote composition of differential operators.
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