## Found 605 Documents (Results 1–100)

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### Perspectives on general left-definite theory. (English)Zbl 07456823

Gesztesy, Fritz (ed.) et al., From operator theory to orthogonal polynomials, combinatorics, and number theory. A volume in honor of Lance Littlejohn’s 70th birthday. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 285, 69-89 (2021).
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### Finite reflection groups and symmetric extensions of Laplacian. (English)Zbl 1480.35123

MSC:  35J05 35J25 47B25
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### Critical magnetic field for 2D magnetic Dirac-Coulomb operators and Hardy inequalities. (English)Zbl 1480.81044

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., 41-63 (2021).
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### Essentially self-adjoint linear relations in Hilbert spaces. (English)Zbl 07434709

MSC:  47A06 47B25 47B65
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### Self-adjoint extensions of bipartite Hamiltonians. (English)Zbl 07414989

MSC:  47B25 81Q10 46N50
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### A model of a boundary composed of the Helmholtz resonators. (English)Zbl 07409848

MSC:  47B25 35P15
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### On the operator equations $$A^n = A^{\ast}A$$. (English)Zbl 07379864

MSC:  47A50 39B42
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### Friedrichs extensions of a class of singular Hamiltonian systems. (English)Zbl 07379511

MSC:  47H06 47B25 34B05
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### Spectral properties of ordinary differential operators admitting special decompositions. (English)Zbl 07359976

MSC:  47E05 47B25 34B24
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### Point-like perturbation of Rashba Hamiltonian. (English)Zbl 1482.47039

MSC:  47B25 81U20
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### The Fuglede theorem and some intertwining relations. (English)Zbl 07286949

MSC:  47A05 47B25 47A62
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### The self-adjointness of the product of two differential operators on metric graph. (Chinese. English summary)Zbl 1484.47040

MSC:  47B25 05C50
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### Self-adjoint extensions of a symmetric linear relation with finite defect: compressions and Straus subspaces. (English)Zbl 07310481

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, 287-325 (2020).
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### Unified canonical forms of fourth order self-adjoint differential operators with transmission conditions. (Chinese. English summary)Zbl 1474.47086

MSC:  47E05 47B25

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MSC:  47B25
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### W. Stenger’s and M. A. Nudelman’s results and resolvent formulas involving compressions. (English)Zbl 1481.47035

MSC:  47B25 47A20 47A56
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### Generalization of Lax equivalence theorem on unbounded self-adjoint operators with applications to Schrödinger operators. (English)Zbl 07222404

MSC:  47B25 47A58 35J10
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MSC:  47B25
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### Asymptotic expansion of large eigenvalues for a class of unbounded Jacobi matrices. (English)Zbl 1443.47037

MSC:  47B36 47B25
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### Reflection principles for functions of Neumann and Dirichlet Laplacians on open reflection invariant subsets of $$\mathbb{R}^d$$. (English)Zbl 1448.35148

MSC:  35J25 35K08 47B25
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### Point-like perturbation for Lamé operator. (English)Zbl 1428.47003

MSC:  47A40 47B25 47F05
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### Preservation of the unconditional basis property under non-self-adjoint perturbations of self-adjoint operators. (English. Russian original)Zbl 1436.46012

Funct. Anal. Appl. 53, No. 3, 192-204 (2019); translation from Funkts. Anal. Prilozh. 53, No. 3, 45-60 (2019).
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### Self-adjoint operators and the general GKN-EM theorem. (English)Zbl 1426.47003

MSC:  47B25 33C45
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### Quasi boundary triples, self-adjoint extensions, and Robin Laplacians on the half-space. (English)Zbl 1425.35123

Alpay, Daniel (ed.) et al., Linear systems, signal processing and hypercomplex analysis. Selected papers of the conference on mathematics, signal processing and linear systems: new problems and directions, Chapman University, Orange, CA, USA, November 14–19, 2017. Cham: Birkhäuser. Oper. Theory: Adv. Appl. 275, 49-66 (2019).
MSC:  35P05 47B25 47F05
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### Equivalence of Littlewood-Paley square function and area function characterizations of weighted product Hardy spaces associated to operators. (English)Zbl 1414.42022

MSC:  42B25 42B30 47B25
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### On supersingular perturbations of non-semibounded self-adjoint operators. (English)Zbl 1424.47056

MSC:  47B25 81Q15 47A70

### Non-self-adjoint singular second-order dynamic operators on time scale. (English)Zbl 1460.34111

MSC:  34N05 47B25 47B44
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### Spectral theory of self-adjoint operators in Hilbert space and elliptic differential operators. (Spektraltheorie selbstadjungierter Operatoren im Hilbertraum und elliptischer Differentialoperatoren.) (German)Zbl 1447.47003

Heidelberg: Springer Spektrum (ISBN 978-3-662-58068-4/pbk; 978-3-662-58069-1/ebook). xii, 259 p. (2019).
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### On extensions of singular fourth order dynamic operators on time scales. (English)Zbl 07546088

MSC:  34N05 47A20 47B25
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### Adjoint and unitary operators on Hilbert spaces. (English)Zbl 1485.47032

MSC:  47B25 47A55
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### Absolute continuity for unbounded positive self-adjoint operators. (English)Zbl 1478.47015

MSC:  47B25 47A07 47A64
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### Compressions of self-adjoint extensions of a symmetric operator and M.G. Krein’s resolvent formula. (English)Zbl 06946537

MSC:  47B25 47A20 47A56
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### Finite-dimensional self-adjoint extensions of a symmetric operator with finite defect and their compressions. (English)Zbl 06864062

Colombo, Fabrizio (ed.) et al., Advances in complex analysis and operator theory. Festschrift in honor of Daniel Alpay’s 60th birthday. Contributions partly based on the presentations at the international conference on complex analysis and operator theory, Chapman University, Orange, CA, USA, November 2016. Cham: Birkhäuser/Springer. Trends Math., 135-163 (2017).
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### Two-interval even order differential operators in direct sum spaces with inner product multiples. (English)Zbl 1399.47122

MSC:  47E05 34L99 47B25

### Self-adjoint extensions of Dirac operator with Coulomb potential. (English)Zbl 1374.81055

Michelangeli, Alessandro (ed.) et al., Advances in quantum mechanics. Contemporary trends and open problems. Cham: Springer (ISBN 978-3-319-58903-9/hbk; 978-3-319-58904-6/ebook). Springer INdAM Series 18, 169-185 (2017).
MSC:  81Q10 81R20 47B25
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### Shell interactions for Dirac operators. (English)Zbl 1374.81053

Michelangeli, Alessandro (ed.) et al., Advances in quantum mechanics. Contemporary trends and open problems. Cham: Springer (ISBN 978-3-319-58903-9/hbk; 978-3-319-58904-6/ebook). Springer INdAM Series 18, 1-14 (2017).
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### On spectral approximation of unbounded Gribov-Intissar operators in Bargmann space. (English)Zbl 1399.47069

MSC:  47A70 47B36
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