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Found 49 Documents (Results 1–49)

Unconditional basis property of the system of root functions of a differential operator with integral boundary conditions. (English. Russian original) Zbl 1447.34076

Differ. Equ. 55, No. 6, 787-805 (2019); translation from Differ. Uravn. 55, No. 6, 803-821 (2019).
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Estimates of root functions of the adjoint of a second-order differential operator with integral boundary conditions. (English. Russian original) Zbl 1398.34127

Differ. Equ. 54, No. 5, 596-607 (2018); translation from Differ. Uravn. 54, No. 5, 602-612 (2018).
MSC:  34L10 34B09 34B10
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Study of spectral properties of a loaded second-order differential operator. (English. Russian original) Zbl 1335.34136

Differ. Equ. 51, No. 7, 857-861 (2015); translation from Differ. Uravn. 51, No. 7, 861-865 (2015).
MSC:  34L10 47E05
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Estimates of the local convergence rate of spectral expansions for even-order differential operators. (English. Russian original) Zbl 1286.34116

Differ. Equ. 49, No. 5, 529-535 (2013); translation from Differ. Uravn. 49, No. 5, 557-563 (2013).
MSC:  34L10
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On the basis property of eigenfunctions of a singular second-order differential operator. (English. Russian original) Zbl 1258.34167

Differ. Equ. 48, No. 8, 1174-1176 (2012); translation from Differ. Uravn. 48, No. 8, 1187-1189 (2012).
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Estimates for the convergence rate of spectral decompositions of even-order differential operators. (English. Russian original) Zbl 1258.47062

Dokl. Math. 86, No. 1, 553-555 (2012); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 445, No. 5, 510-512 (2012).
MSC:  47E05 34L10
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On various characteristics affecting the local convergence rate of biorthogonal series related to ordinary differential operators. (English. Russian original) Zbl 1209.34107

Dokl. Math. 81, No. 1, 124-127 (2010); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 430, No. 6, 743-746 (2010).
MSC:  34L10 34B15
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A generalized Bessel inequality for ordinary differential operators with nonsmooth coefficients and a generalization of the Riesz theorem. (English. Russian original) Zbl 0997.34079

Differ. Equ. 36, No. 12, 1777-1788 (2000); translation from Differ. Uravn. 36, No. 12, 1621-1630 (2000).
MSC:  34L10 34B24 34B05
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The influence of the integrability degree of coefficients of differential operators on the equiconvergence rate of spectral expansions. I. (English. Russian original) Zbl 1014.34076

Differ. Equations 34, No. 5, 621-630 (1998); translation from Differ. Uravn. 34, No. 5, 619-628 (1998).
MSC:  34L10 34A30 47E05
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Properties of root functions of a Sturm-Liouville operator discontinuous on an everywhere-dense set. (English. Russian original) Zbl 0724.34031

Sov. Math. 34, No. 8, 39-49 (1990); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1990, No. 8(339), 35-44 (1990).
MSC:  34B24 34L10
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Estimates of root vectors of multipoint spectral problems. (English. Russian original) Zbl 0679.34019

Sov. Math., Dokl. 38, No. 3, 662-664 (1989); translation from Dokl. Akad. Nauk SSSR 303, No. 6, 1304-1306 (1988).
Reviewer: L.Berg
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