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Found 282 Documents (Results 1–100)

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Eigenvalue accumulation and bounds for non-selfadjoint matrix differential operators related to NLS. (English) Zbl 1478.35157

Exner, Pavel (ed.) et al., Partial differential equations, spectral theory, and mathematical physics. The Ari Laptev anniversary volume. Berlin: European Mathematical Society (EMS). EMS Ser. Congr. Rep., 445-456 (2021).
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On necessary and sufficient condition in theory of regularized traces. (Russian. English translation) Zbl 1474.47039

Ufim. Mat. Zh. 12, No. 4, 92-100 (2020); translation in Ufa Math. J., No. 4, 90-98 (2020).
MSC:  47A55 47B02 47B10
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Spectral decompositions of selfadjoint relations in Pontryagin spaces and factorizations of generalized Nevanlinna functions. (English) Zbl 07310487

Alpay, Daniel (ed.) et al., Complex function theory, operator theory, Schur analysis and systems theory. A volume in honor of V. E. Katsnelson. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 280, 515-534 (2020).
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Sequence spaces. Topics in modern summability theory. (English) Zbl 1468.46003

Mathematics and its Applications: Modelling, Engineering, and Social Sciences. Boca Raton, FL: CRC Press (ISBN 978-0-367-81917-0/hbk; 978-1-032-17319-1/pbk; 978-1-003-01511-6/ebook). xx, 292 p. (2020).
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The method of similar operators in the spectral analysis of the Hill operator with nonsmooth potential. (English. Russian original) Zbl 1441.47054

Sb. Math. 208, No. 1, 1-43 (2017); translation from Mat. Sb. 208, No. 1, 3-47 (2017).
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Locally definitizable operators: the local structure of the spectrum. (English) Zbl 1422.47046

Alpay, Daniel (ed.), Operator theory. With 51 figures and 2 tables. In 2 volumes. Springer Reference. Basel: Springer. 241-259 (2015).
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Estimates for the Green’s function and parameters of exponential dichotomy of a hyperbolic operator semigroup and linear relations. (English. Russian original) Zbl 1335.47027

Sb. Math. 206, No. 8, 1049-1086 (2015); translation from Mat. Sb. 206, No. 8, 23-62 (2015).
MSC:  47D06 34G10 47B39
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Maps with separable dynamics and the spectral properties of the operators generated by them. (English. Russian original) Zbl 1334.47034

Sb. Math. 206, No. 3, 341-369 (2015); translation from Mat. Sb. 206, No. 3, 3-34 (2015).
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The spectral theory of a functional-difference operator in conformal field theory. (English. Russian original) Zbl 1327.39013

Izv. Math. 79, No. 2, 388-410 (2015); translation from Izv. Ross. Akad. Nauk, Ser. Mat 79, No. 2, 181-204 (2015).
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Difference operators and operator-valued matrices of the second order. (English. Russian original) Zbl 1362.47019

Izv. Math. 79, No. 2, 217-232 (2015); translation from Izv. Ross. Akad. Nauk, Ser. Mat 79, No. 2, 3-20 (2015).
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Analysis of linear differential equations by methods of the spectral theory of difference operators and linear relations. (English. Russian original) Zbl 1279.34069

Russ. Math. Surv. 68, No. 1, 69-116 (2013); translation from Usp. Mat. Nauk 68, No. 1, 77-128 (2013).
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Enforced stability of an eigenvalue in the continuous spectrum of a waveguide with an obstacle. (Russian, English) Zbl 1249.78029

Zh. Vychisl. Mat. Mat. Fiz. 52, No. 3, 521-538 (2012); translation in Comput. Math. Math. Phys. 52, No. 3, 448-464 (2012).
MSC:  78A50 35P15 35J05
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On conditions for invertibility of difference and differential operators in weight spaces. (English. Russian original) Zbl 1228.47034

Izv. Math. 75, No. 4, 665-680 (2011); translation from Izv. Ross. Akad. Nauk, Ser. Mat. 75, No. 4, 3-20 (2011).
MSC:  47B37 47B39
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Quantization conditions on Riemannian surfaces and the semiclassical spectrum of the Schrödinger operator with complex potential. (English. Russian original) Zbl 1234.81077

Math. Notes 88, No. 2, 209-227 (2010); translation from Mat. Zametki 88, No. 2, 229-248 (2010).
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A functional model, eigenvalues, and finite singular critical points for indefinite Sturm-Liouville operators. (English) Zbl 1206.47040

Ball, Joseph A. (ed.) et al., Topics in operator theory. Volume 2: Systems and mathematical physics. Proceedings of the 19th international workshop on operator theory and applications (IWOTA), College of William and Mary, Williamsburg, VA, USA, July 22–26, 2008. A tribute to Israel Gohberg on the occasion of his 80th birthday. Basel: Birkhäuser (ISBN 978-3-0346-0160-3/hbk; 978-3-0346-0163-4/set; 978-3-0346-0161-0/ebook). Operator Theory: Advances and Applications 203, 247-287 (2010).
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