JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS, vol.9, no.3, pp.319-336, 2007 (Journal Indexed in SCI)
Article / Article
Title of Journal :
JOURNAL OF COMPUTATIONAL ANALYSIS AND APPLICATIONS
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.