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Found 162 Documents (Results 1–100)

Transformation operator for the Schrödinger equation with additional exponential potential. (English. Russian original) Zbl 07806535

Russ. Math. 67, No. 9, 68-75 (2023); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2023, No. 9, 76-84 (2023).
MSC:  34Lxx 40-XX 34A05
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On the nonclassical asymptotics of the eigenvalues of a boundary value problem for a second-order differential-operator equation. (English. English summary) Zbl 1516.34122

Differ. Equ. 58, No. 12, 1571-1578 (2022); translation from Differ. Uravn. 58, No. 12, 1587-1595 (2022).
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On regular solvability of a boundary value problem for a fourth order operator differential equation on a finite segment. (English) Zbl 1513.34226

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On spectral properties of the one-dimensional Stark operator on the semiaxis. (English. Russian original) Zbl 1509.34089

Ukr. Math. J. 71, No. 11, 1813-1819 (2020); translation from Ukr. Mat. Zh. 71, No. 11, 1579-1584 (2019).
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Spectral properties of the Sturm-Liouville operator with a spectral parameter quadratically included in the boundary condition. (Russian. English summary) Zbl 1479.34053

MSC:  34B24 34B07 34L20
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Solvability of a boundary value problem for elliptic differential-operator equations of the second order with a quadratic complex parameter. (English. Russian original) Zbl 07276428

Differ. Equ. 56, No. 10, 1306-1317 (2020); translation from Differ. Uravn. 56, No. 10, 1339-1350 (2020).
MSC:  47-XX 34-XX
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Inverse spectral problem for the Schrödinger equation with an additional linear potential. (English. Russian original) Zbl 1445.81018

Theor. Math. Phys. 202, No. 1, 58-71 (2020); translation from Teor. Mat. Fiz. 202, No. 1, 66-80 (2020).
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Bessel inequality and the basis property for a \(2m\times 2m\) Dirac type system with an integrable potential. (English. Russian original) Zbl 1456.34082

Differ. Equ. 56, No. 5, 573-584 (2020); translation from Differ. Uravn. 56, No. 5, 584-594 (2020).
MSC:  34L40 34L10
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Asymptotic behavior of eigenvalues of a boundary value problem for a second-order elliptic differential-operator equation with spectral parameter in the equation and a boundary condition. (English. Russian original) Zbl 1444.34071

Differ. Equ. 56, No. 2, 190-198 (2020); translation from Differ. Uravn. 56, No. 2, 195-203 (2020).
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Convergence of eigenfunction expansions for a boundary value problem with spectral parameter in the boundary conditions. I. (English. Russian original) Zbl 1444.34035

Differ. Equ. 56, No. 2, 143-157 (2020); translation from Differ. Uravn. 56, No. 2, 147-161 (2020).
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