## Found 1,580 Documents (Results 1–100)

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### Numerical computation of eigenvalues in spectral gaps of Schrödinger operators. (English)Zbl 07553124

MSC:  65L15 34B09
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### Spectral gaps of the Laplacian on differential forms. (English)Zbl 07548711

Chen, Bang-Yen (ed.) et al., Differential geometry and global analysis. AMS special session honoring the memory of Tadashi Nagano (1930–2017), Denver, CO, USA, January 16, 2020. Providence, RI: American Mathematical Society (AMS). Contemp. Math. 777, 127-135 (2022).
MSC:  53C21 58J50 53C23
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### The spectrum of the Laplacian and volume growth of proper minimal submanifolds. (English)Zbl 07540305

MSC:  58C40 53C42 58J50
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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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### On the number of eigenvalues of the lattice model operator in one-dimensional case. (English)Zbl 07530767

MSC:  81Qxx 35Pxx 47Axx
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### On the spectrum of some Bloch-Torrey vector operators. (English)Zbl 07526483

MSC:  35P05 35B25 35J15
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### Essential numerical range and $$C$$-numerical range for unbounded operators. (English)Zbl 07523098

MSC:  47A12 47A10
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### Invariance of the essential spectra of closed linear operator pencils on a Banach space. (English)Zbl 07517125

MSC:  47A10 47A53 34K08
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### On essential numerical ranges and essential spectra of Hamiltonian systems with one singular endpoint. (English)Zbl 07515365

MSC:  37Jxx 47A55 47A12
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### About essential spectra of unbounded Jacobi matrices. (English)Zbl 07509391

MSC:  47B36 42C05 39A22
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### Spectral properties for generalized weakly $$S$$-demicompact operators. (English)Zbl 07491080

MSC:  47A53 47A10
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### On a minimax principle in spectral gaps. (English)Zbl 07489688

MSC:  47A55 47A10 47A75
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### Essential spectra of weighted composition operators induced by elliptic automorphisms. (English)Zbl 07489511

MSC:  47B33 46E15 47B48
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### Dirac operators with delta-interactions on smooth hypersurfaces in $$\mathbb{R}^n$$. (English)Zbl 1485.35147

MSC:  35J10 35Q41
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### G-Riesz operators and their spectral properties. (English)Zbl 07486145

MSC:  47A10 47A55 47A53
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### Slice regular weighted composition operators. (English)Zbl 07481776

MSC:  47B33 32A36
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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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### Jacobi matrices on trees generated by Angelesco systems: asymptotics of coefficients and essential spectrum. (English)Zbl 07483996

MSC:  47B36 47A10 42C05
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### Dirac operators with singular potentials supported on unbounded surfaces in $$\mathbb{R}^3$$. (English. Russian original)Zbl 1486.81101

Funct. Anal. Appl. 55, No. 3, 245-249 (2021); translation from Funkts. Anal. Prilozh. 55, No. 3, 85-90 (2021).
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### Asymptotics of eigenvalues of perturbed bilaplacian in the 1D lattice. (English)Zbl 1485.47064

MSC:  47B93 39A12 81Q35
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### Structure of essential spectrum and discrete spectrum of the energy operator of five-electron systems in the Hubbard model – doublet states. (English)Zbl 1480.81060

Kusraev, Anatoly G. (ed.) et al., Operator theory and differential equations. Selected papers based on the presentations at the 15th conference on order analysis and related problems of mathematical modeling, Vladikavkaz, Russia, July 15–20, 2019. Cham: Birkhäuser. Trends Math., 275-301 (2021).
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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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### 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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### $$S$$-spectra and $$S$$-essential pseudospectra of the diagonal block operator matrices. (English)Zbl 1484.47010

MSC:  47A08 47A10
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### Generalized weak demicompactness involving measure of non-strict-singularity. (English)Zbl 07423849

MSC:  47A53 47A10
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### Some Fredholm theory results around relative demicompactness concept. (English)Zbl 07407074

MSC:  47A10 47A55 47A53
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### Essential spectra of singular Hamiltonian differential operators of arbitrary order under a class of perturbations. (English)Zbl 07387811

MSC:  34L05 47E05 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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### Spectral mapping theorems for differentiable $$C_0$$ semigroups. (English)Zbl 07343249

MSC:  47D03 47A10 47A11
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### Discrete Laplace operator of 3-cochains. (English)Zbl 1465.35123

MSC:  35J05 35R02 47A10
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### $$L_\mu^p$$-spectra of pseudo-differential operators associated with the Bessel operator. (English)Zbl 07332543

MSC:  47G30 35S05
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### Maximal $$\mathcal{J}$$-semi-definite invariant subspaces of unbounded $$\mathcal{J}$$-selfadjoint operators in Krein spaces. (English)Zbl 1487.47015

MSC:  47A15 47B50 47A10
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### On the eigenvalues of spectral gaps of matrix-valued Schrödinger operators. (English)Zbl 1459.65045

MSC:  65F15 15A18 34L40
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### Relative $$\varepsilon$$-pseudo weak demicompactness and measures of weak noncompactness. (English)Zbl 07296614

MSC:  47A53 47A10
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### On relative essential spectra of a $$3 \times 3$$ operator matrix involving relative generalized weak demicompactness. (English)Zbl 07541519

MSC:  47A08 47A53 47A10
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### Operator matrices and their Weyl type theorems. (English)Zbl 07541215

MSC:  47A08 47A10 47A53
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### On the structure of the essential spectrum for three-particle discrete Schrödinger operators on the four dimensional lattices. (English)Zbl 07387680

MSC:  81Q10 35P20 47N50
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### Relations for the spectrum of a $$3\times 3$$ block operator matrix. (English)Zbl 07382732

MSC:  81Q10 35P20 47N50
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### The existence and location of eigenvalues of the one-particle discrete Schrödinger operator on a lattice. (English)Zbl 07382731

MSC:  81Q35 39A12 34L40
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### New branches of the essential spectrum of a $$2\times 2$$ operator matrix. (English)Zbl 07382724

MSC:  81Q10 35P20 47N50
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### Pathology of essential spectra of elliptic problems in periodic family of beads threaded by a spoke thinning at infinity. (English)Zbl 1467.35226

MSC:  35P05 35J57
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### The proof of $$(\omega_1)$$ property for operators and functional calculus. (The judgement of $$(\omega_1)$$ property for operators and function calculus.) (Chinese. English summary)Zbl 1474.47029

MSC:  47A25 47A53 47A60

### On negative eigenvalues of the Schrodinger operator. (English)Zbl 1465.35322

MSC:  35P20 35J10 81Q35
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### Proof of a-Weyl’s theorem for bounded linear operators. (Judgement of a-Weyl’s theorem for bounded linear operators.) (Chinese. English summary)Zbl 1474.47037

MSC:  47A53 47A55 47A10

### Unified approach to spectral properties of multipliers. (English)Zbl 07334575

MSC:  47B35 47B38
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### Essential spectrum of periodic medium with sparsely placed foreign inclusions. (English)Zbl 1460.35131

MSC:  35J57 35P99
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### On the essential spectrum of the diagonal of an operator. (English)Zbl 07324427

MSC:  47A10 47A53 47B47
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### Spectral gaps on complete Riemannian manifolds. (English)Zbl 1461.53024

Van der Veken, Joeri (ed.) et al., Geometry of submanifolds. AMS special session in honor of Bang-Yen Chen’s 75th birthday, University of Michigan, Ann Arbor, Michigan, October 20–21, 2018. Providence, RI: American Mathematical Society (AMS). Contemp. Math. 756, 57-67 (2020).
MSC:  53C21 53C23 58J50
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### Infinite number of eigenvalues of $$2\times 2$$ operator matrices: asymptotic discrete spectrum. (English. Russian original)Zbl 1458.81023

Theor. Math. Phys. 205, No. 3, 1564-1584 (2020); translation from Teor. Mat. Fiz. 205, No. 3, 368-390 (2020).
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### The essential spectrum of the discrete Laplacian on Klaus-sparse graphs. (English)Zbl 1456.05106

MSC:  05C50 47E05 47A10
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### Invariance of the essential spectra of operator pencils. (English)Zbl 07299680

Curto, Raul E. (ed.) et al., Operator theory, operator algebras and their interactions with geometry and topology. Ronald G. Douglas memorial volume. Proceedings of the international workshop on operator theory and applications (IWOTA 2018), Shanghai, China, July 23–27, 2018. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 278, 203-219 (2020).
MSC:  47A06 47A53 47A56
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### The band-gap structure of the spectrum in a periodic medium of masonry type. (English)Zbl 1454.35130

MSC:  35J57 35P99 47B25
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### Sequence of multivalued linear operators converging in the generalized sense. (English)Zbl 07290389

MSC:  47A06 39B42
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### The essential spectrum of one-dimensional Dirac operators with delta interactions. (English. Russian original)Zbl 1454.34115

Funct. Anal. Appl. 54, No. 2, 145-148 (2020); translation from Funkts. Anal. Prilozh. 54, No. 2, 90-94 (2020).
MSC:  34L05 34L40
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### About the spectral properties of one three-partial model operator. (English. Russian original)Zbl 1453.82041

Russ. Math. 64, No. 5, 1-7 (2020); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2020, No. 5, 3-10 (2020).
MSC:  82C10 47B25
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### Dirac operators on $$\mathbb{R}$$ with general point interactions. (English)Zbl 07244866

Bauer, Wolfram (ed.) et al., Operator algebras, Toeplitz operators and related topics. Selected papers based on the presentations at the international workshop, Boca del Rio, Veracruz, Mexico, November 13–19, 2018. In honor of Nikolai Vasilevskin on the occasion of his 70th birthday. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 279, 351-381 (2020).
MSC:  47-XX 46Lxx
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### The spectrum of the Laplacian on forms over flat manifolds. (English)Zbl 1447.58030

MSC:  58J50 53C35
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### Essential spectrum of upper triangular operator matrices. (English)Zbl 07222426

MSC:  47A08 47A10 47A55
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### Spectra of a class of non-symmetric operators in Hilbert spaces with applications to singular differential operators. (English)Zbl 07220505

MSC:  47B25 34B24
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