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Found 163 Documents (Results 1–100)

Inverse theorems on the approximation of periodic functions with high generalized smoothness. (English. Russian original) Zbl 1485.42003

Math. Notes 111, No. 2, 320-323 (2022); translation from Mat. Zametki 111, No. 2, 312-315 (2022).
MSC:  42A10 41A50 46E35
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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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Hardy-Steklov operators and the duality principle in weighted first-order Sobolev spaces on the real axis. (English. Russian original) Zbl 1421.42013

Math. Notes 105, No. 1, 91-103 (2019); translation from Mat. Zametki 105, No. 1, 108-122 (2019).
MSC:  42B35 47G10 46E35
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Embeddings of spaces of functions of positive smoothness on irregular domains in Lebesgue spaces. (English. Russian original) Zbl 1404.46028

Math. Notes 103, No. 3, 348-356 (2018); translation from Mat. Zametki 103, No. 3, 336-345 (2018); erratum ibid 103, No. 3, 865 (2018).
MSC:  46E35
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\(L_p\)-inequalities for differences and derivatives of positive order for functions with spectrum in the ball or spherical layer. (English. Russian original) Zbl 1338.42032

Math. Notes 95, No. 3, 388-398 (2014); translation from Mat. Zametki 95, No. 3, 433-444 (2014).
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On the spectrum of singular perturbations of operators on the circle. (English. Russian original) Zbl 1283.47042

Math. Notes 91, No. 4, 588-591 (2012); translation from Mat. Zametki 91, No. 4, 629-932 (2012).
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Dependence of the convergence domain of spectral expansions on the geometry of the set of discontinuity of the function being expanded. (English. Russian original) Zbl 1145.42006

Math. Notes 79, No. 2, 165-177 (2006); translation from Mat. Zametki 79, No. 2, 178-193 (2006).
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Estimates of solutions to equations with aftereffect in Sobolev spaces and the basis of divided differences. (English. Russian original) Zbl 1029.46038

Math. Notes 72, No. 2, 271-274 (2002); translation from Mat. Zametki 72, No. 2, 303-306 (2002).
MSC:  46E35
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Multipliers in dual Sobolev spaces and Schrödinger operators with distribution potentials. (English. Russian original) Zbl 1029.46029

Math. Notes 71, No. 5, 587-594 (2002); translation from Mat. Zametki 71, No. 5, 643-651 (2002).
MSC:  46E35 35J10
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On lattices of invariant and hyperinvariant subspaces of the operators \(J^\alpha\otimes B\) in Sobolev spaces. (English. Russian original) Zbl 1034.47504

Math. Notes 70, No. 4, 508-514 (2001); translation from Mat. Zametki 70, No. 4, 560-567 (2001).
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On the interpolation of some generalized function spaces of different anisotropy. (English. Russian original) Zbl 0914.46027

Math. Notes 62, No. 5, 557-561 (1997); translation from Mat. Zametki 62, No. 5, 666-672 (1997); letter to the editor ibid. 78, No. 1, 146 (2005); translation from ibid. 78, No. 1, 156 (2005).
MSC:  46E35 46M35
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Estimate of approximate characteristics for classes of functions with bounded mixed derivative. (English. Russian original) Zbl 0878.46023

Math. Notes 58, No. 6, 1340-1342 (1995); translation from Mat. Zametki 58, No. 6, 922-925 (1995).
MSC:  46E35 41A46
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Exact values of Bernstein widths of Sobolev classes of periodic functions. (English. Russian original) Zbl 0859.41019

Math. Notes 58, No. 1, 770-774 (1995); translation from Mat. Zametki 58, No. 1, 139-143 (1995).
MSC:  41A46 46E35
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Exact inequalities for norms of intermediate derivatives of quasiperiodic functions. (English. Russian original) Zbl 0840.26013

Math. Notes 56, No. 6, 1300-1303 (1994); translation from Mat. Zametki 56, No. 6, 127-130 (1994).
MSC:  26D10 42A75 46E35
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