On  -Convergence\\ of the  -th Derivative of Cosine Series\\     with  -quasi convex coefficients

doi:10.1285/i15900932v30n2p113

On $L_{1}$ -Convergence\\ of the $r$ -th Derivative of Cosine Series\\ with $r$ -quasi convex coefficients

N.L. Braha, Xh. Z. Krasniqi

Abstract

We study $L_{1}$ -convergence of $r-th$ derivative of modified cosine sums introduced in \cite{BN}. Exactly it is proved the $L_{1}$ - convergence of $r-th$ derivative of modified cosine sums with $r$ -quasi convex coefficients.

DOI Code: 10.1285/i15900932v30n2p113

Keywords: cosine sums; L1-convergence; r-quasi convex null sequences

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Note di Matematica

On -Convergence\\ of the -th Derivative of Cosine Series\\ with -quasi convex coefficients

Abstract

On $L_{1}$ -Convergence\\ of the $r$ -th Derivative of Cosine Series\\ with $r$ -quasi convex coefficients