## Found 241 Documents (Results 1–100)

100
MathJax

MSC:  47A06
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### On some essential spectra of off-diagonal block operator matrix with application. (English)Zbl 07535194

MSC:  47A08 47A53
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### On a characterization of Jeribi, Rakočević, Schechter, Schmoeger and Wolf essential spectra of a $$3 \times 3$$ block operator matrices with non diagonal domain and application. (English)Zbl 07533189

MSC:  47A10 47A53 34K08
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### Spectrum of weighted composition operators. VII: Essential spectra of weighted composition operators on $$C(K)$$. The case of non-invertible homeomorphisms. (English)Zbl 07478452

MSC:  47B33 47A10
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### Spectrum of weighted composition operators. VI: Essential spectra of $$d$$-endomorphisms of Banach $$C(K)$$-modules. (English)Zbl 07437493

MSC:  47B33 47B48 47A10
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### Stability of some essential B-spectra of pencil operators and application. (English)Zbl 07434054

MSC:  47A53 47A55
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### Essential S-spectrum for quaternionic quasi-compact operators on right quaternionic Hilbert spaces. (English)Zbl 1481.47116

MSC:  47S05 47A06 47A55
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### Left-right essential spectra of one-sided operator matrix and application. (English)Zbl 07361677

Jeribi, Aref (ed.), Operator theory. Proceedings of the international conference on operator theory, Hammamet, Tunisia, April 30 – May 3, 2018. Berlin: De Gruyter. De Gruyter Proc. Math., 157-175 (2021).
MSC:  47A10 47A53 34K08
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### Invariance of essential spectrum by means of generalized weak demicompactness. (English)Zbl 07361673

Jeribi, Aref (ed.), Operator theory. Proceedings of the international conference on operator theory, Hammamet, Tunisia, April 30 – May 3, 2018. Berlin: De Gruyter. De Gruyter Proc. Math., 115-120 (2021).
MSC:  47A53 47A10
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MSC:  47A06
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### On upper triangular operator $$2 \times 2$$ matrices over $$C^\ast$$-algebras. (English)Zbl 07539194

MSC:  47A08 46L08 47A53
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### Spectra of weighted composition operators on analytic function spaces. (English)Zbl 07167246

MSC:  47B33 47B38
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### Spectral theory for polynomially demicompact operators. (English)Zbl 07535113

MSC:  47A53 47A55 47A10
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### Upper triangular operator matrices and limit points of the essential spectrum. (English)Zbl 07216103

MSC:  47A10 47A11
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### Stability of essential spectra of closed operators under $$T$$-compact equivalence. (English)Zbl 1438.47025

MSC:  47A53 47A55 47N50
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### To the spectral theory of partially ordered sets. (English. Russian original)Zbl 1481.06008

Sib. Math. J. 60, No. 3, 450-463 (2019); translation from Sib. Mat. Zh. 60, No. 3, 578-598 (2019).
MSC:  06A07 06B30 54B35
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### On the essential spectra of unbounded operator matrices with non diagonal domain and an application. (English)Zbl 1448.47009

MSC:  47A08 47A53 34K08
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### Spectral properties for $$\gamma$$-diagonally dominant operator matrices using demicompactness classes and applications. (English)Zbl 07092250

MSC:  47A55 47A53 47H08
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### Fredholm criteria in a $$C^{\ast}$$-algebra acting on the Hardy space of the bi-disc with applications to composition operators. (English)Zbl 07087187

MSC:  47-XX 30-XX
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### Asymptotics of the eigenvalues and eigenfunctions of a thin square Dirichlet lattice with a curved ligament. (English. Russian original)Zbl 1419.35144

Math. Notes 105, No. 4, 559-579 (2019); translation from Mat. Zametki 105, No. 4, 564-588 (2019).
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### The essential spectra of infinite dimensional Hamilton operator. (Chinese. English summary)Zbl 1424.47014

MSC:  47A10 47A53 47A55

### Stability of essential B-spectra of unbounded linear operators and applications. (English)Zbl 1413.47012

MSC:  47A10 47A53
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### Spectral properties for polynomial and matrix operators involving demicompactness classes. (English)Zbl 06999814

MSC:  47A53 47A55 47A10

MSC:  47B33
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### Polynomially demicompact operators and spectral theory for operator matrices involving demicompactness classes. (English)Zbl 06982147

MSC:  47A53 47A55 47A10
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### Multipliers on the Dirichlet space for the annulus. (English)Zbl 1413.42016

MSC:  42B15 42B35 47A10
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### Spectra of some weighted composition operators on dual Banach spaces of analytic functions. (English)Zbl 06909741

MSC:  47B33 47B38
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MSC:  47A06
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MSC:  47B33
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### Jeribi essential spectrum. (English)Zbl 1475.47003

MSC:  47A10 47A53 47H08
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### Essential spectrum of Schrödinger operators with $$\delta$$-interactions on unbounded hypersurfaces. (English. Russian original)Zbl 1381.35152

Math. Notes 102, No. 5, 698-709 (2017); translation from Mat. Zametki 102, No. 5, 761-773 (2017).
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### On the essential spectra of coupled operators matrix and application. (English)Zbl 06836389

MSC:  47A10 47A53
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### The essential spectrum of a sequence of linear operators in Banach spaces. (English)Zbl 1463.47016

MSC:  47A10 47B01
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### Some properties of the Wolf and Weyl essential spectra of a sequence of linear operators $$\nu$$-convergent. (English)Zbl 1458.47006

MSC:  47A10 47B01 47A58
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### The structure of essential spectra and discrete spectrum of four-electron systems in the Hubbard model in a singlet state. (English)Zbl 1372.81183

Lobachevskii J. Math. 38, No. 3, 530-541 (2017); erratum ibid. 38, No. 4, 778 (2017).
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### Quasi-compact operator, pseudo-essential spectra and some perturbation results. (English)Zbl 06722464

MSC:  47-XX 81-XX
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### Generalized Kato-Riesz decomposition and generalized Drazin-Riesz invertible operators. (English)Zbl 06707968

MSC:  47A53 47A10
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### A characterization of some subsets of essential spectra of a multivalued linear operator. (English)Zbl 1454.47006

MSC:  47A06 47A10
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### Spectrum of weighted composition operators. III: Essential spectra of some disjointness preserving operators on Banach lattices. (English)Zbl 1411.47007

de Jeu, Marcel (ed.) et al., Ordered structures and applications. Positivity VII (Zaanen centennial conference), Leiden, the Netherlands, July 22–26, 2013. Basel: Birkhäuser/Springer. Trends Math., 233-261 (2016).
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MSC:  47-XX
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### On relative essential spectra of block operator matrices and application. (English)Zbl 1347.47003

MSC:  47A10 47A53 34K08
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### On a characterization of the structured Wolf, Schechter and Browder essential pseudospectra. (English)Zbl 1330.47010

MSC:  47A10 47A53 47A55
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MSC:  82-XX
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### Some properties of the $$M$$-essential spectra of closed linear operator on a Banach space. (English)Zbl 1355.47007

MSC:  47A53 47A55 47A10
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### The essential spectra of a singular transport semigroup in slab geometry. (Chinese. English summary)Zbl 1349.47072

MSC:  47D06 47A10 35P05

### On a characterization of the $$S$$-essential spectra of the sum and the product of two operators and application to a transport operator. (English)Zbl 1349.47013

MSC:  47A53 47A55 47G20
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### Some properties of upper triangular $$3\times 3$$-block matrices of linear relations. (English)Zbl 1330.47005

MSC:  47A06 47A53
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### On the eigenvalues of a $$2\times 2$$ block operator matrix. (English)Zbl 1329.81181

MSC:  81Q10 35P20 47N50
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### An eigenvalue multiplicity formula for the Schur complement of a $$3\times3$$ block operator matrix. (English. Russian original)Zbl 1323.47010

Sib. Math. J. 56, No. 4, 699-713 (2015); translation from Sib. Mat. Zh. 56, No. 4, 878-895 (2015).
MSC:  47A56 81Q10
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### Spectral mapping theorem for Rakocević and Schmoeger essential spectra of a multivalued linear operator. (English)Zbl 1354.47003

MSC:  47A06 47A10
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### Stability of essential spectra of bounded linear operators. (English)Zbl 1341.47015

MSC:  47A55 47A53 47A10
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### Stability of the $$S$$-left and $$S$$-right essential spectra of a linear operator. (English)Zbl 1340.47024

MSC:  47A53 47A55 47A10
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### On the $$(\alpha, \beta)$$-essential spectrum of upper triangular operator matrices. (Chinese. English summary)Zbl 1324.47028

MSC:  47A53 47A10 47A55

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### A characterization of compact SG pseudo-differential operators on $$L^{2}(\mathbb{R}^n)$$. (English)Zbl 1304.35794

MSC:  35S05 47G30
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### S-essential spectra and application to an example of transport operators. (English)Zbl 1300.47013

MSC:  47A10 47G20
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### Spectral theory of a hybrid class of pseudo-differential operators. (English)Zbl 1302.35484

MSC:  35S05 47G30 47A53
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### On the M-essential spectra of two-group transport equations. (English)Zbl 06353370

MSC:  47A53 47A55 54B35
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### Spectral properties of two classes of averaging operators on the little Bloch space and the analytic Besov spaces. (English)Zbl 1339.47040

MSC:  47B38 46E15 47B40
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### Parabolic non-automorphism induced Toeplitz-composition C*-algebras with piece-wise quasi-continuous symbols. (English)Zbl 1327.47026

MSC:  47B35 47L80 47B33
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### On the essential spectra of some matrix of linear relations. (English)Zbl 1331.47001

MSC:  47A06 47A55 47A25
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### Fredholm perturbations and seminorms related to upper semi-Fredholm perturbations. (English)Zbl 1324.47030

MSC:  47A55 47A53
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### A characterization of the essential pseudospectra and application to a transport equation. (English)Zbl 1308.47012

MSC:  47A53 47A10

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### Stability of the $$\mathbf S$$-essential spectra on a Banach space. (English)Zbl 1324.47025

MSC:  47A53 47A55
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### A note on the spectra of a $$3 \times 3$$ operator matrix and application. (English)Zbl 1261.47009

MSC:  47A10 47A53 47A55
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MSC:  47A10

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### On graph measures in Banach spaces and description of essential spectra of multidimensional transport equation. (English)Zbl 1266.47072

MSC:  47H08 47A53 47A55
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### A characterization of compact pseudo-differential operators on $$\mathbb S^1$$. (English)Zbl 1260.47050

Rodino, Luigi (ed.) et al., Pseudo-differential operators: analysis, applications and computations. Selected papers based on lectures presented at the meeting of the ISAAC Group in Pseudo-Differential Operators (IGPDO), London, UK, July 13–18, 2009. Basel: Birkhäuser (ISBN 978-3-0348-0048-8/hbk; 978-3-0348-0049-5/ebook). Operator Theory: Advances and Applications 213, 25-29 (2011).
MSC:  47G30
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### Spectral theory of pseudo-differential operators on $$\mathbb S^{1}$$. (English)Zbl 1260.47051

Rodino, Luigi (ed.) et al., Pseudo-differential operators: analysis, applications and computations. Selected papers based on lectures presented at the meeting of the ISAAC Group in Pseudo-Differential Operators (IGPDO), London, UK, July 13–18, 2009. Basel: Birkhäuser (ISBN 978-3-0348-0048-8/hbk; 978-3-0348-0049-5/ebook). Operator Theory: Advances and Applications 213, 15-23 (2011).
MSC:  47G30 46E35
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### Essential self-adjointness, generalized eigenforms, and spectra for the $$\bar {\partial}$$-Neumann problem on G-manifolds. (English)Zbl 1257.58020

MSC:  58J50 35P15 32W05
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### Localization near the corner point of the principal eigenfunction of the Dirichlet problem in a domain with thin edging. (English. Russian original)Zbl 1221.35257

Sib. Math. J. 52, No. 2, 274-290 (2011); translation from Sib. Mat. Zh. 52, No. 2, 350-370 (2011).
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### Inherited properties through the Helton class of an operator. (English)Zbl 1216.47073

MSC:  47B99 47A10 47B20
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### Gustafson, Weidmann, Kato, Wolf, Schechter and Browder essential spectra of some matrix operator and application to two-group transport equation. (English)Zbl 1217.15013

MSC:  15A18 47A10 47A53
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### The essential norm and spectrum of a weighted composition operator on $$H^{\infty }(B_{N})$$. (English)Zbl 1236.47021

MSC:  47B33 46E15 32A37
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### Symmetric family of Fredholm operators of indices zero, stability of essential spectra and application to transport operators. (English)Zbl 1181.47011

MSC:  47A53 47A10 82D75
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### The essential spectrum of boundary value problems for systems of differential equations in a bounded domain with a cusp. (English. Russian original)Zbl 1271.35055

Funct. Anal. Appl. 43, No. 1, 44-54 (2009); translation from Funkts. Anal. Prilozh. 43, No. 1, 55-67 (2009).
MSC:  35P05
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