Applied Mathematics and Computation, vol.218, no.3, pp.1046-1051, 2011 (SCI-Expanded)
A lower triangular matrix with nonzero principal diagonal entries is called a triangle. In this paper we obtain the sufficient conditions for ∑anλn to be summable Ak whenever ∑an is summable Tk for a triangle T. © 2011 Elsevier Inc. All rights reserved.