Limit-point criteria for not necessarily symmetric ordinary differential expressions (Q1178517)
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scientific article; zbMATH DE number 21777
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Limit-point criteria for not necessarily symmetric ordinary differential expressions |
scientific article; zbMATH DE number 21777 |
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Limit-point criteria for not necessarily symmetric ordinary differential expressions (English)
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26 June 1992
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Sufficient conditions on the coefficients for \(M\) to be in the limit- point case are found. Here \(M\) is a not necessarily symmetric (formally selfadjoint) ordinary differential expression. These conditions are found by applying known results to powers of the symmetric case \(M^ +M\), where \(M^ +\) is the adjoint expression. Examples are given to show that new criteria can be obtained in this way. In fact, some criteria can be improved by taking higher and higher powers.
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limit-point criteria
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not necessarily symmetric ordinary differential expressions
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