JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS, cilt.9, ss.319-336, 2007 (SCI İndekslerine Giren Dergi)
We obtain necessary and sufficient conditions for the series Sigma a(n) summable \A\ to imply that Sigma a(n)lambda(n) is summable \B\(k), and for the series Sigma(an) summable \A\(k) to imply that Sigma a(n)lambda(n) is summable \B\, k >= 1 where A and B are lower triangular matrices.