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On the spectrum of a family of non-self-adjoint boundary value problems for systems of helmholtz equations

✍ Scribed by Yu.V Shestopalov


Publisher
Elsevier Science
Year
1981
Weight
712 KB
Volume
21
Category
Article
ISSN
0041-5553

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The Essential Spectrum of a Non-Elliptic
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In this note a matrix partial differential operator is considered. It is shown that under certain conditions it defines a closed operator with nonempty resolvent set, and its essential spectrum is determined. In the symmetric case G. D. RAIKOV obtained earlier corresponding results (under slightly d