A Cohen type inequality for Fourier expansions of orthogonal polynomials with a nondiscrete Jacobi-Sobolev inner product.
Fejzullahu, Bujar Xh., Marcellán, Francisco (2010)
Journal of Inequalities and Applications [electronic only]
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Fejzullahu, Bujar Xh., Marcellán, Francisco (2010)
Journal of Inequalities and Applications [electronic only]
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Georg Gasper, Walter Trebls (1979)
Mathematische Annalen
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Deeba, E.Y., Koh, E.L. (1985)
International Journal of Mathematics and Mathematical Sciences
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A. D. Gadjiev, R. O. Efendiyev, E. Ibikli (2003)
Czechoslovak Mathematical Journal
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It is shown that a Korovkin type theorem for a sequence of linear positive operators acting in weighted space does not hold in all this space and is satisfied only on some subspace.