The Spectra of General Differential Operators in the Direct Sum Spaces

DOI10.1023/B:CMAJ.0000027244.85935.99zbMath1058.34110MaRDI QIDQ4814511

Sobhy El-Sayed Ibrahim

Publication date: 7 September 2004

Published in: Czechoslovak Mathematical Journal (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/30835

zbMATH Keywords

essential spectradirect sum spacesregularly solvable operatorsquasi-differential expressionsjoint field of regularity

Mathematics Subject Classification ID

General spectral theory of ordinary differential operators (34L05) General theory of ordinary differential operators (47E05) Eigenvalues, estimation of eigenvalues, upper and lower bounds of ordinary differential operators (34L15)

Cites Work

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• The theory of J-selfadjoint extensions of J-symmetric operators
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• Formally self-adjoint quasidifferential operators
• On the essential spectra of regularly solvable operators in the direct sum spaces
• The point spectra and regularity fields of non-selfadjoint quasi- differential operators
• Regularly solvable extensions of non-self-adjoint ordinary differential operators
• Boundary conditions for general ordinary differential operators and their adjoints
• On the essential spectra of linear 2nth order differential operators with complex coefficients
• Some Remarks on Linear Ordinary Quasi-Differential Expressions
• On the location of the essential spectra and regularity fields of complex Sturm—Liouville operators
• The spectra of well-posed operators
• INTEGRABLE-SQUARE SOLUTIONS OF ORDINARY DIFFERENTIAL EQUATIONS (III)

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