On eigenfunction expansions for a class of irregular quadratic pencils of second-order differential operators

DOI10.1134/S1995080221050152zbMath1471.34159OpenAlexW3166761068MaRDI QIDQ2032386

Yanyan Li

Publication date: 11 June 2021

Published in: Lobachevskii Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1134/s1995080221050152

zbMATH Keywords

eigenvaluesdifferential operatoreigenfunction expansionsecond orderquadratic pencilirregular penciltwo-fold expansion

Mathematics Subject Classification ID

Eigenfunctions, eigenfunction expansions, completeness of eigenfunctions of ordinary differential operators (34L10) Eigenvalues, estimation of eigenvalues, upper and lower bounds of ordinary differential operators (34L15)

Cites Work

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• Boundary problems for ordinary differential equations with parameter in the boundary conditions
• On completeness of eigenfunctions of quadratic bundles of ordinary differential operators
• First and second order differentiation operators with weight functions of variable sign

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