On the Bessel property of systems of root functions of a differential operator. (Q1432399)
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scientific article; zbMATH DE number 2074692
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | On the Bessel property of systems of root functions of a differential operator. |
scientific article; zbMATH DE number 2074692 |
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On the Bessel property of systems of root functions of a differential operator. (English)
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15 June 2004
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The author proves a necessary condition for systems of normalized root functions of a differential operator to be Bessel. He obtains a sharp estimate on the eigenvalues and refines the criterion for the Bessel property.
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Bessel property
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root functions
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sharp estimate on eigenvalues
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