## Found 304 Documents (Results 1–100)

100
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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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### A note on formulae for the generalized Drazin inverse of anti-triangular block operator matrices in Banach spaces. (English)Zbl 07525104

MSC:  15A09 46H05 47A05
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MSC:  47A12
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### Existence results for a system of nonlinear operator equations and block operator matrices in locally convex spaces. (English)Zbl 07501798

MSC:  47H10 47H08 45G15
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### Spectral properties for generalized weakly $$S$$-demicompact operators. (English)Zbl 07491080

MSC:  47A53 47A10
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MSC:  47A12
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### Characterizations and representations for the Drazin inverse of anti-triangular block operator matrices with index less than two. (English)Zbl 07515559

MSC:  15A09 15A10 47A05
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### Leray-Schauder fixed point theorems for block operator matrix with an application. (English)Zbl 1481.47066

MSC:  47H10 47H08
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### Taylor spectrum approach to Brownian-type operators with quasinormal entry. (English)Zbl 07334024

MSC:  47B20 47B37 44A60
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### Bounded $$C_0$$-semigroups and applications to linear stability of heteroclinic solutions in precipitation models. (English)Zbl 1478.47039

MSC:  47D06 34C37 34D20
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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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### Universal block tridiagonalization in $$\mathcal{B}(\mathcal{H})$$ and beyond. (English)Zbl 1487.47031

Aron, Richard M. (ed.) et al., The mathematical legacy of Victor Lomonosov. Operator theory. Berlin: De Gruyter. Adv. Anal. Geom. 2, 317-326 (2020).
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### Limit points for Browder spectrum of operator matrices. (English)Zbl 07217851

MSC:  47A10 47A08
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### $$J$$-self-adjoint projections in Krein spaces. (English)Zbl 1451.46025

MSC:  46C20 47B50
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### Approximation of the block numerical range of block operator matrices. (English)Zbl 07537944

MSC:  47A08 47A12 47A58
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### Generalizations of numerical radius inequalities related to block matrices. (English)Zbl 07537456

MSC:  47A12 47A30 47A08
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### On the mixed-type generalized inverses of the products of two operators. (English)Zbl 07536944

MSC:  15A09 47A05
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### Some operator inequalities of measurable operators. (English)Zbl 1463.47051

MSC:  47A63 47A30 47B06
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### Mixed-type reverse order laws associated to $$\{1, 3, 4\}$$-inverse. (English)Zbl 1449.47007

MSC:  47A05 47A62 15A09
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### A block form of a singular pencil of operators and a method of obtaining it. (Russian. English summary)Zbl 1438.47027

MSC:  47A56 15A22 47N20
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### Essential and Weyl spectra of unbounded $$2 \times 2$$ block operator matrices. (Chinese. English summary)Zbl 1438.47010

MSC:  47A08 47A10 47A53

### Shift-splitting preconditioners for a class of block three-by-three saddle point problems. (English)Zbl 07111438

MSC:  65-XX 47-XX
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### A converse of the characterization of operator geometric means. (English)Zbl 07103364

MSC:  47A63 47A64 47B65

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### On a norm inequality for a positive block-matrix. (English)Zbl 1410.15041

MSC:  15A45 15A60 15B57
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### Operator means and positivity of block operators. (English)Zbl 06898024

MSC:  47A63 47A64 15A45
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### The properties of partial trace and block trace operators of partitioned matrices. (English)Zbl 1390.15091

MSC:  15A99 47B99

### Weighted composition and block shift matrix operators on $$\ell^2(\mathbb{N})$$ space. (English)Zbl 1462.47020

MSC:  47B33 47B37 47B20
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### A geometric mean for Toeplitz and Toeplitz-block block-Toeplitz matrices. (English)Zbl 06865817

MSC:  47B35 47A64 15A45
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### The essential spectrum of some unbounded block operator matrices. (Chinese. English summary)Zbl 1399.47020

MSC:  47A10 47A53
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### On equivalence and linearization of operator matrix functions with unbounded entries. (English)Zbl 06832761

MSC:  47A56 47A10
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MSC:  47A53
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### Block circulant and Toeplitz structures in the linearized Hartree-Fock equation on finite lattices: tensor approach. (English)Zbl 1380.65355

MSC:  65N25 35Q84 35P15
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### Test of independence for high-dimensional random vectors based on freeness in block correlation matrices. (English)Zbl 1362.62123

MSC:  62H15 46L54 60B20
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### Frobenius-Schur factorization for multivalued $$2\times2$$ matrices linear operator. (English)Zbl 1476.47004

MSC:  47A06 47A08 47A68
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MSC:  47A05
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### Variational principles for self-adjoint operator functions arising from second-order systems. (English)Zbl 1356.47019

MSC:  47A56 49R05 47A10
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### A course in finite group representation theory. (English)Zbl 1371.20002

Cambridge Studies in Advanced Mathematics 161. Cambridge: Cambridge University Press (ISBN 978-1-107-16239-6/hbk; 978-1-316-67721-6/ebook). xi, 325 p. (2016).
MSC:  20-01 20Cxx
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### Branches of the essential spectrum of the lattice spin-boson model with at most two photons. (English. Russian original)Zbl 1338.81439

Theor. Math. Phys. 186, No. 2, 251-267 (2016); translation from Teor. Mat. Fiz. 186, No. 2, 293-310 (2016).
MSC:  81V80 81T25 81Q10
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### On the Drazin inverse of an anti-triangular block matrix. (English)Zbl 1327.15009

MSC:  15A09 47A05
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### Invertible completion for a class of four block operator matrices. (Chinese. English summary)Zbl 1349.15071

MSC:  15A83 15A09

### 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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MSC:  47A05
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### Spectral inclusion properties of some unbounded block operator matrices. (Chinese. English summary)Zbl 1485.47005

MSC:  47A08 47A10 47A12
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### New results of the reverse order law for the Moore-Penrose reverse. (Chinese. English summary)Zbl 1340.15010

MSC:  15A09 47A05 15A60

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### A subnormal Toeplitz completion problem. (English)Zbl 1327.47025

Ball, Joseph A. (ed.) et al., Operator theory in harmonic and non-commutative analysis. 23rd international workshop in operator theory and its applications, IWOTA, Sydney, Australia, July 16–20, 2012. Cham: Birkhäuser/Springer (ISBN 978-3-319-06265-5/hbk; 978-3-319-06266-2/ebook). Operator Theory: Advances and Applications 240, 87-110 (2014).
MSC:  47B35 47B20 47-02
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### The block numerical range of analytic operator functions. (English)Zbl 1321.47030

MSC:  47A56 47A12
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### Equivalences of matrix polynomials. (English)Zbl 1340.47030

MSC:  47A56 15A22
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### A direct solver with $$O(N)$$ complexity for variable coefficient elliptic PDEs discretized via a high-order composite spectral collocation method. (English)Zbl 1303.65099

MSC:  65N35 35J25
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### On spectrum of differential operator with block-triangular matrix coefficients. (English)Zbl 1311.34055

MSC:  34B24 47A10 34L05
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### A formalism for designing robust multigrid methods for Helmholtz-like problems. (English)Zbl 1281.65153

MSC:  65N55 65F10 35J05
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### A fast block Krylov implicit Runge-Kutta method for solving large-scale ordinary differential equations. (English)Zbl 1311.65096

Chinchuluun, Altannar (ed.) et al., Optimization, simulation, and control. New York, NY: Springer (ISBN 978-1-4614-5130-3/hbk; 978-1-4614-5131-0/ebook). Springer Optimization and Its Applications 76, 319-330 (2013).
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### Linear maps preserving $$q$$ numerical range of linear operator. (Chinese. English summary)Zbl 1299.47071

MSC:  47B49 47A12
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MSC:  47A05
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### A modified Jacobi-conjugate preconditioned gradient method for symmetric eigenvalue problems. (English)Zbl 1289.65078

MSC:  65F15 65F30
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### The inner structure of the Jacobi-Laurent matrix related to the strong Hamburger moment problem. (English)Zbl 1289.47029

MSC:  47A57 44A60

MSC:  81U40

### Spectral properties between operator matrices and Helton class. (English)Zbl 1297.47008

MSC:  47A11 47A15 47A53
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### Hyponormal Toeplitz operators with matrix-valued circulant symbols. (English)Zbl 1300.47038

MSC:  47B35 47A57
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### New results on reverse order law for $$\{1,2,3\}$$- and $$\{1,2,4\}$$-inverses of bounded operators. (English)Zbl 1279.15010

MSC:  15A09 47B37 47A05
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### Upper and lower bounds for products of multiplication operator and Hausdorff matrix on block weighted sequence spaces. (English)Zbl 1399.47096

MSC:  47B37 47A30
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### Hyponormal Toeplitz operators on the polydisk. (English)Zbl 1334.47033

MSC:  47B35 47B20
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### The matrix version of Hamburger’s theorem. (English. Russian original)Zbl 1283.44002

Math. Notes 91, No. 4, 493-499 (2012); translation from Mat. Zametki 91, No. 4, 522-529 (2012).
MSC:  44A60 47A57 30E05
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### Approximation of the quadratic numerical range of block operator matrices. (English)Zbl 1277.47009

MSC:  47A12 15A60
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### On rank invariance of generalized block Pick matrices of matrix-valued Carathéodory functions. (Chinese. English summary)Zbl 1255.47018

MSC:  47A57 30E05

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