Geodesic
Boundedness and compactness of a certain class of matrix operators with variable limits of summation
Eurasian mathematical journal, Tome 11 (2020) no. 4, pp. 66-75.

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Necessary and sufficient conditions for the boundedness and compactness of the matrix operator of the form $(Af)_n=\sum_{k=\alpha(n)}^{\beta(n)}a_{n,k}f_k$, from $l_{p,v}$ to $l_{q,u}$ when $1$ are given. 
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A. M. Temirkhanova; A. T. Beszhanova. Boundedness and compactness of a certain class of matrix operators with variable limits of summation. Eurasian mathematical journal, Tome 11 (2020) no. 4, pp. 66-75. http://geodesic.mathdoc.fr/item/EMJ_2020_11_4_a5/

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