Some observations and remarks on differential operators generated by first-order boundary value problems. (Q1874157)
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scientific article; zbMATH DE number 1915234
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Some observations and remarks on differential operators generated by first-order boundary value problems. |
scientific article; zbMATH DE number 1915234 |
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Some observations and remarks on differential operators generated by first-order boundary value problems. (English)
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22 May 2003
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In the introduction, the authors give a brief summary on \(n\)-th order differential expressions defined via quasi-derivatives. In the subsequent sections, the case of first-order systems is discussed in more detail. In particular, conditions for self-adjoint extensions and discreteness of their spectrum are given.
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first order differential operator
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self-adjoint extension
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spectrum
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boundary value problems
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deficiency indices
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