Xhevat Z. Krasniqi, Department of Mathematics and Computer Sciences, University of Prishtina, Avenue Mother Theresa 5, Prishtinë, 10000, Republic of Kosova, e-mail: xhevat-z-krasniqi@hotmail.com
Abstract: In the paper, we prove two theorems on $|A, \delta|_k$ summability, $1\leq k\leq2$, of orthogonal series. Several known and new results are also deduced as corollaries of the main results.
Keywords: orthogonal series, matrix summability
Classification (MSC 2010): 42C15, 40F05, 40D15
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