Displaying similar documents to “Integrability and L 1 -convergence of Rees-Stanojević sums with generalized semiconvex coefficients.”

On the behavior near the origin of double sine series with monotone coefficients

Xhevat Z. Krasniqi (2009)

Mathematica Bohemica

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In this paper we obtain estimates of the sum of double sine series near the origin, with monotone coefficients tending to zero. In particular (if the coefficients a k , l satisfy certain conditions) the following order equality is proved g ( x , y ) m n a m , n + m n l = 1 n - 1 l a m , l + n m k = 1 m - 1 k a k , n + 1 m n l = 1 n - 1 k = 1 m - 1 k l a k , l , where x ( π m + 1 , π m ] , y ( π n + 1 , π n ] , m , n = 1 , 2 , .