Savaş, Ekrem2015-09-142015-09-1420071687-1847https://hdl.handle.net/11467/1189http://dx.doi.org/10.1155/2007/10892The goal of this paper is to obtain sufficient and (different) necessary conditions for a series Sigma a(n), which is absolutely summable of order k by a triangular matrix method A, 1 < k <= s < infinity, to be such that Sigma a(n)lambda(n) is absolutely summable of order s by a triangular matrix method B. As corollaries, we obtain two inclusion theorems.eninfo:eu-repo/semantics/openAccessAbsolute SummabilityInclusion RelationsArticle226710Q3WOS:000245276800001Q22-s2.0-3424721971310.1155/2007/10892