dc.contributor.author | Orujov, Ashraf D. | |
dc.date.accessioned | 2019-07-27T12:10:23Z | |
dc.date.accessioned | 2019-07-28T09:48:19Z | |
dc.date.available | 2019-07-27T12:10:23Z | |
dc.date.available | 2019-07-28T09:48:19Z | |
dc.date.issued | 2015 | |
dc.identifier.issn | 1687-2770 | |
dc.identifier.uri | https://dx.doi.org/10.1186/s13661-015-0380-y | |
dc.identifier.uri | https://hdl.handle.net/20.500.12418/7790 | |
dc.description | WOS: 000361548900001 | en_US |
dc.description.abstract | In this paper, the spectrum and resolvent of the operator L-lambda generated by the differential expression L-lambda(y) = y '' + q(1)(x)y' + [lambda(2) + lambda q(2)(x) + q(3)(x)] y and the boundary condition y'(0) - hy(0) = 0 are investigated in the space L-2(R+). Here the coefficients q(1)(x), q(2)(x), q(3)(x) are periodic functions whose Fourier series are absolutely convergent and Fourier exponents are positive. It is shown that continuous spectrum of the operator L-lambda consists of the interval (-infinity, +infinity). Moreover, at most a countable set of spectral singularities can exists over the continuous spectrum and at most a countable set of eigenvalues can be located outside of the interval (-infinity, +infinity). Eigenvalues and spectral singularities with sufficiently large modulus are simple and lie near the points lambda = +n/2, n is an element of N. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | SPRINGER INTERNATIONAL PUBLISHING AG | en_US |
dc.relation.isversionof | 10.1186/s13661-015-0380-y | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | periodic | en_US |
dc.subject | spectrum | en_US |
dc.subject | resolvent | en_US |
dc.subject | eigenvalue | en_US |
dc.subject | spectral singularity | en_US |
dc.title | On the spectrum of the quadratic pencil of differential operators with periodic coefficients on the semi-axis | en_US |
dc.type | article | en_US |
dc.relation.journal | BOUNDARY VALUE PROBLEMS | en_US |
dc.contributor.department | Cumhuriyet Univ, Dept Elementary Educ, TR-58140 Sivas, Turkey | en_US |
dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı | en_US |