Document Details Document Type : Article In Journal  Document Title : Double sigma-multiplicative matrices Double sigma-multiplicative matrices   Document Language : Arabic  Abstract : The class of sigma-regular matrices was defined and characterized by Schaefer [P. Schaefer, Infinite matrices and invariant means, Proc. Amer. Math. Soc. 36 (1972) 104-110] and further studied by Mursaleen [Mursaleen, On some new invariant matrix methods of summability, Quart. J. Math. Oxford 34 (1983) 77-86], Ahmad and Mursaleen [Z.U. Ahmad, Mursaleen, An application of Banach limits, Proc. Amer. Math. Soc. 103 (1988) 244-246]. In this paper we characterize four-dimensional sigma-multiplicative matrices, and establish a core theorem. (c) 2006 Elsevier Inc. All rights reserved.  Journal Name : JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS  Volume : 327  Issue Number : 2  Publishing Year : 2007 AH   Added Date : Tuesday, June 17, 2008  Researchers Researcher Name (Arabic) Researcher Name (English) Researcher Type Dr Grade Email . Mursaleen Researcher     . Mohiuddine, S. A Researcher     Back To Researches Page