On the basis property of systems of eigenfunctions and associated functions of a second-order differential operator (Q1385960)
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scientific article; zbMATH DE number 1148143
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | On the basis property of systems of eigenfunctions and associated functions of a second-order differential operator |
scientific article; zbMATH DE number 1148143 |
Statements
On the basis property of systems of eigenfunctions and associated functions of a second-order differential operator (English)
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7 February 1999
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The main result in this announcement is a necessary condition for the system of eigenfunctions and associated functions of \(u''+qu=\lambda u\) on a finite interval to have the usual basis property. This condition was previously known to be necessary for the unconditional basis property. Sufficient conditions are considered.
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eigenfunctions and associated functions
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basis property
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