Savas, E2025-05-102025-05-1020040096-300310.1016/S0096-3003(03)00359-X2-s2.0-1542507126https://doi.org/10.1016/S0096-3003(03)00359-Xhttps://hdl.handle.net/20.500.14720/14809Let 1 < k less than or equal to s < infinity. In this paper we obtain necessary conditions for a series summable \A\(k) to imply that the series is summable \B\(s), where A and B are two lower triangular matrices. We also obtain several corollaries. (C) 2003 Elsevier Inc. All rights reserved.eninfo:eu-repo/semantics/closedAccessAbsolute SummabilityInclusion RelationsTriangular MatricesWeighted Mean MatricesArticle1512Q1Q1523531WOS:000220533100017