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Found 18 Documents (Results 1–18)

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On the positivity of average sums of sine series with monotone coefficients. (English. Russian original) Zbl 1480.42005

Math. Notes 110, No. 4, 623-627 (2021); translation from Mat. Zametki 110, No. 4, 630-634 (2021).
MSC:  42A32
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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 07431869

Math. Notes 110, No. 4, 489-496 (2021); translation from Mat. Zametki 110, No. 4, 498-506 (2021).
MSC:  33C45 34Lxx
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Approximation properties of the Vallée-Poussin means of partial sums of a special series in Laguerre polynomials. (English. Russian original) Zbl 07431868

Math. Notes 110, No. 4, 475-488 (2021); translation from Mat. Zametki 110, No. 4, 483-497 (2021).
MSC:  33Cxx 42Cxx 41Axx
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