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Found 1,960 Documents (Results 1–100)

\(j\)-self-adjointness conditions for Jacobi matrices and Schrödinger and Dirac operators with point interactions. (English. Russian original) Zbl 07550611

Math. Notes 111, No. 6, 970-976 (2022); translation from Mat. Zametki 111, No. 6, 940-946 (2022).
MSC:  47B36 34L40 81Q10
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Multilevel interpolation for Nikishin systems and boundedness of Jacobi matrices on binary trees. (English. Russian original) Zbl 07505216

Russ. Math. Surv. 76, No. 4, 726-728 (2021); translation from Usp. Mat. Nauk 76, No. 4, 179-180 (2021).
MSC:  47B36 41A21 65Q30
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On the discreteness of the spectrum of matrix Schrödinger and Dirac operators with point interactions. (English. Russian original) Zbl 07455576

Math. Notes 110, No. 6, 960-966 (2021); translation from Mat. Zametki 110, No. 6, 932-938 (2021).
MSC:  47B36 34L40
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Orthogonality relations for the primitives of Legendre polynomials and their applications to some spectral problems for differential operators. (English. Russian original) Zbl 1497.33012

Math. Notes 110, No. 4, 489-496 (2021); translation from Mat. Zametki 110, No. 4, 498-506 (2021).
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Titchmarsh-Weyl formula for the spectral density of a class of Jacobi matrices in the critical case. (English. Russian original) Zbl 1478.15051

Funct. Anal. Appl. 55, No. 2, 94-112 (2021); translation from Funkts. Anal. Prilozh. 55, No. 2, 21-43 (2021).
MSC:  15B52 60B20 33C45
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