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Found 542 Documents (Results 1–100)

The role of the branch cut of the logarithm in the definition of the spectral determinant for non-selfadjoint operators. arXiv:2312.07155

Preprint, arXiv:2312.07155 [math-ph] (2023).
MSC:  34L15 47A10
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Spectral estimates for the fourth-order differential operator with periodic coefficients. (English. Russian original) Zbl 07659026

Russ. Math. 66, No. 7, 76-81 (2022); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2022, No. 7, 86-92 (2022).
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Weighted string equation where the weight is a noncompact multiplier: continuous spectrum and eigenvalues. (English. Russian original) Zbl 1506.34108

St. Petersbg. Math. J. 33, No. 4, 697-709 (2022); translation from Algebra Anal. 33, No. 4, 155-172 (2021).
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Completeness and minimality of eigenfunctions and associated functions of ordinary differential operators. (English) Zbl 1510.34187

de Snoo, H. S. V. (ed.) et al., Contributions to mathematics and statistics. Essays in honor of Seppo Hassi. Vaasa: University of Vaasa, School of Technology and Innovation. Acta Wasaensia 462, 141-151 (2021).
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On conditions on the potential in a Sturm-Liouville problem and an upper estimate of its first eigenvalue. (English) Zbl 1458.34052

Pinelas, Sandra (ed.) et al., Differential and difference equations with applications. Selected papers based on the presentations at the fourth international conference, ICDDEA 2019, Lisbon, Portugal, July 1–5, 2019. Cham: Springer. Springer Proc. Math. Stat. 333, 481-496 (2020).
MSC:  34B24 34L15 47J30
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