Found 282 Documents (Results 1–100)

100
MathJax

On the fine spectrum of the operator $$Q (r, s, t, u)$$ over $$\ell_p$$ and $$bv_p$$, $$1 < p < \infty$$. (English)Zbl 07556038

MSC:  47A10 47B37 47B39
Full Text:

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).
Full Text:

Full Text:

Full Text:

New sufficient conditions for the computation of generalized eigenvalues. (English. Russian original)Zbl 1482.47028

Russ. Math. 65, No. 2, 65-68 (2021); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2021, No. 2, 74-78 (2021).
MSC:  47A75 47B01
Full Text:

Full Text:

Maximal $$\mathcal{J}$$-semi-definite invariant subspaces of unbounded $$\mathcal{J}$$-selfadjoint operators in Krein spaces. (English)Zbl 1487.47015

MSC:  47A15 47B50 47A10
Full Text:

A survey on the spectra of the difference operators over the Banach space $$c$$. (English)Zbl 07309504

MSC:  47A10 46A45
Full Text:

On the spectra of the operator $$B(\widetilde{r},\widetilde{s})$$ mapping in $$(w_{\infty}(\lambda))_{a}$$ and $$(w_{0}(\lambda))_{a}$$ where $$\lambda$$ is a nondecreasing exponentially bounded sequence. (English)Zbl 1474.40019

MSC:  40C05 46A45 47B37
Full Text:

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
Full Text:

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).
Full Text:

Full Text:

On unbounded integral operators with quasisymmetric kernels. (Russian. English summary)Zbl 1463.45058

MSC:  45P05 47B34
Full Text:

Criteria for the absence of point spectrum on the boundary of the numerical range of tridiagonal matrices. (English)Zbl 07291447

MSC:  47A12 47A10
Full Text:

On the fine spectrum of quadruple band matrix operator over $$c_0$$ and $$c$$. (English)Zbl 07274820

MSC:  47A10 47B37 47B39
Full Text:

On the existence of normal square and nth roots of operators. (English)Zbl 07261137

MSC:  47A62 47A05
Full Text:

Full Text:

On the description of multidimensional normal Hausdorff operators on Lebesgue spaces. (English)Zbl 07175501

MSC:  47B38 47B15 46E30
Full Text:

On the spectra of difference operators over some Banach spaces. (English)Zbl 1423.47001

Dutta, Hemen (ed.) et al., Applied mathematical analysis: theory, methods, and applications. Cham: Springer. Stud. Syst. Decis. Control 177, 791-810 (2020).
MSC:  47A10 40A05 46A45
Full Text:

Full Text:

A survey for the spectrum of triangles over sequence spaces. (English)Zbl 07122690

MSC:  47A10 47B37
Full Text:

Spectral properties of first-order differential operators with an involution and groups of operators. (Russian. English summary)Zbl 1428.35241

MSC:  35P05 35L04 47F05
Full Text:

Maps preserving the local spectral radius zero of generalized product of operators. (English)Zbl 07120182

MSC:  47B49 47A10 47A11
Full Text:

On some study of the fine spectra of triangular band matrices. (English)Zbl 1480.47048

MSC:  47B37 47A10
Full Text:

Maps preserving the inner local spectral radius zero of generalized product of operators. (English)Zbl 07078563

MSC:  47B49 47A10 47A11
Full Text:

Full Text:

Fine spectrum of the generalized difference operator $$\Delta_{uv}$$ on the sequence space $$c_0$$. (English)Zbl 1447.41004

MSC:  41A17 47H09
Full Text:

Full Text:

Spectrum and fine spectrum of the Zweier matrix over the sequence space $$cs$$. (English)Zbl 1424.47012

MSC:  47A10 47B37
Full Text:

On the fine spectrum of the lower triangular matrix $$B(r,s)$$ over the Hahn sequence space. (English)Zbl 06841229

MSC:  47A10 47B37
Full Text:

Spectral controllability of some singular hyperbolic equations on networks. (English)Zbl 1386.35234

MSC:  35K65 93B05 93B07
Full Text:

On the spectrum and fine spectrum of the upper triangular matrix $$U(r_1,r_2;s_1,s_2)$$ over the sequence space $$c_0$$. (English)Zbl 1370.47005

MSC:  47A10 47B37
Full Text:

Spectral analysis of operator polynomials and higher-order difference operators. (English. Russian original)Zbl 06751111

Math. Notes 101, No. 3, 391-405 (2017); translation from Mat. Zametki 101, No. 3, 330-345 (2017).
MSC:  47-XX 39-XX
Full Text:

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).
Full Text:

Full Text:

On some study of the fine spectra of $$n$$-th band triangular matrices. (English)Zbl 1480.47045

MSC:  47B37 47A10
Full Text:

Full Text:

Full Text:

A note on the operator equation generalizing the notion of slant Hankel operators. (English)Zbl 1389.47054

MSC:  47A62 47B35
Full Text:

On the fine spectrum of generalized upper triangular triple-band matrices $$(\Delta^2_{uvw})^t$$ over the sequence space $$l_1$$. (English)Zbl 1465.47022

MSC:  47B37 47B39 47A10
Full Text:

Two invariant subspaces and spectral properties of a linear operator. (English)Zbl 1399.47001

MSC:  47A05 47A15
Full Text:

On the fine spectrum of generalized upper triangular double-band matrices $$\Delta^{uv}$$ over the sequence spaces $$c_0$$ and $$c$$. (English)Zbl 1375.47026

MSC:  47B37 47A10
Full Text:

Notes on the spectral properties of the weighted mean difference operator $$G(u,v;\Delta)$$ over the sequence space $$\ell_1$$. (English)Zbl 1363.47009

MSC:  47A10 47B37 47B39
Full Text:

Fine spectra of triangular triple-band matrices on sequence spaces $$c$$ and $$\ell_p, (0<p<1)$$. (English)Zbl 1348.47026

MSC:  47B37 47A10
Full Text:

Full Text:

On the fine spectrum of the generalized difference operator defined by a double sequential band matrix over the sequence space $$\ell_p, (1 < p < \infty)$$. (English)Zbl 1362.47018

MSC:  47B39 47A10 47B37
Full Text:

Spectrum and fine spectrum of the upper triangular matrix $$U(r,s)$$ over the sequence spaces $$cs$$. (English)Zbl 1330.47008

MSC:  47A10 47B37
Full Text:

Full Text:

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).
Full Text:

Full Text:

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
Full Text:

M. A. Krasnosel’skii theorem and iterative methods for solving ill-posed linear problems. (English)Zbl 1319.47007

MSC:  47A52 65J20
Full Text:

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).
Full Text:

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).
Full Text:

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).
Full Text:

Compact composition operators on real Banach spaces of complex-valued bounded Lipschitz functions. (English)Zbl 1412.46065

MSC:  46J10 47B48 46J15
Full Text:

MSC:  47B48
Full Text:

On spectral properties of a new operator over sequence spaces $$c$$ and $$c_0$$. (English)Zbl 1324.47009

MSC:  47A10 47B37
Full Text:

On a spectral classification of the operator $$\Delta_\nu^r$$ over the sequence space $$c_0$$. (English)Zbl 1314.39021

MSC:  39A70 47B39 47A10
Full Text:

Spectra and fine spectra of certain lower triangular double-band matrices as operators on $$c_0$$. (English)Zbl 1309.47006

MSC:  47A10 47B37
Full Text:

On the fine spectrum of the operator $$B (r, s, t)$$ over the class of convergent series. (English)Zbl 1409.47002

MSC:  47A10 47B37 47B39

Inversion of a linear combination of values of the resolvent of a closed operator. (Russian. English summary)Zbl 1298.47002

MSC:  47A05 47A10
Full Text:

Full Text:

On the spectrum of 2-nd order generalized difference operator $$\Delta^2$$over the sequence space $$c_0$$. (English)Zbl 1413.47013

MSC:  47A10 40A05 46A45
Full Text:

On the fine spectrum of generalized upper double-band matrices $$\Delta^{uv}$$ over the sequence space $$l_1$$. (English)Zbl 1299.47008

MSC:  47A10 47B37

On the fine spectrum of the operator defined by the lambda matrix over the spaces of null and convergent sequences. (English)Zbl 1315.47004

MSC:  47A10 40A05 46A45
Full Text:

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).
Full Text:

Compact composition operators on noncompact Lipschitz spaces. (English)Zbl 1279.47042

MSC:  47B33 46E15
Full Text:

Some spectral properties of the generalized difference operator $$\Delta_v$$. (English)Zbl 1389.47096

MSC:  47B39 47A10
Full Text:

Full Text:

The spectrum of a degenerated second-order ordinary differential operator. (Russian. English summary)Zbl 1289.34232

MSC:  34L05 47E05

On the structure of a semigroup of operators with finite-dimensional ranges. (English. Russian original)Zbl 1284.47029

Math. Notes 91, No. 2, 231-242 (2012); translation from Mat. Zametki 91, No. 2, 240-252 (2012).
MSC:  47D06 47A65
Full Text:

On the fine spectra of the Zweier matrix as an operator over the weighted sequence space $$\ell_{p}(w)$$. (English)Zbl 1281.47003

MSC:  47A10 47B37
Full Text:

$$\mathcal A_S$$-scalar operators. (English)Zbl 1289.47010

MSC:  47A10 47B99

Spectrum and fine spectrum of generalized second order forward difference operator $$\Delta^2_{uvw}$$ on sequence space $$l_1$$. (English)Zbl 1300.47014

MSC:  47A10 47B39 46A45
Full Text:

On the fine spectra of the generalized difference operator $$\Delta_{uv}$$ over the sequence space $$c_0$$. (English)Zbl 1261.47041

MSC:  47B37 47A10

On the fine spectrum of the second order difference operator over the sequence spaces $$\ell_p$$ and $$bv_p$$, ($$1<p<\infty$$). (English)Zbl 1255.47037

MSC:  47B39 39A70 46B45
Full Text:

Full Text:

Full Text:

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
Full Text:

Fine spectrum of the generalized difference operator $$\varDelta _{uv}$$ on sequence space $$l_{1}$$. (English)Zbl 1262.47055

MSC:  47B39 47A10
Full Text:

Full Text:

Asymptotics of the spectrum of nonsmooth perturbations of differential operators of order $$2m$$. (English. Russian original)Zbl 1281.47029

Math. Notes 90, No. 6, 813-823 (2011); translation from Mat. Zametki 90, No. 6, 833-844 (2011).
MSC:  47E05 47A55 35P20
Full Text:

On the fine spectra of the generalized forward difference operator $$\Delta^v$$ over the sequence space $$\ell_1$$. (English)Zbl 1260.47037

MSC:  47B39 47A10 47B37
Full Text:

Full Text:

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
Full Text:

Full Text:

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).
Full Text:

Full Text:

Fine spectrum of the generalized difference operator $$\Delta_v$$ on sequence space $$l_1$$. (English)Zbl 1236.47029

MSC:  47B39 47A10 46A45

On the fine spectrum of the operator $$B(r,s,t)$$ over the sequence spaces $$\ell_p$$ and $$bv_p$$,($$1<p<\infty$$). (English)Zbl 1222.47050

MSC:  47B39 40C05 46B45
Full Text:

On the boundary-value problem for a class of operator-differential equations of third order. (English. Russian original)Zbl 1207.34026

Math. Notes 87, No. 4, 590-593 (2010); translation from Mat. Zametki 87, No. 4, 632-635 (2010).
MSC:  34B15 34G10
Full Text:

Fine spectra of upper triangular double-band matrices. (English)Zbl 1193.47006

MSC:  47A10 47B37
Full Text:

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).
Full Text:

The Browder and Weyl spectra of an operator and its diagonal. (English)Zbl 1289.47074

MSC:  47B47 47A10 47A11

all top 5

all top 5

all top 5

all top 3