Savaş, Ekrem2015-09-142015-09-1420101787-2405https://hdl.handle.net/11467/1179We obtain necessary conditions for the series Sigma Sigma c(mn), which is absolutely summable of order k by a doubly triangular matrix method A, to be such that Sigma Sigma c(mn)lambda(mn) is absolutely summable of order k by a doubly triangular matrix Beninfo:eu-repo/semantics/openAccessAbsolute Summability FactorsDoubly Triangular SummabilityArticle1121189Q4WOS:000285688600010Q32-s2.0-79958714518