Necessary conditions for double summability factor theorem

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Savaş E.

Miskolc Mathematical Notes, vol.11, no.2, pp.183-190, 2010 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 11 Issue: 2
  • Publication Date: 2010
  • Doi Number: 10.18514/mmn.2010.251
  • Journal Name: Miskolc Mathematical Notes
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.183-190
  • Keywords: Absolute summability factors, Doubly triangular summability
  • Uşak University Affiliated: No

Abstract

We obtain necessary conditions for the series ΣΣcmn, which is absolutely summable of order k by a doubly triangular matrix method A, to be such that ΣΣcmnλmn is absolutely summable of order k by a doubly triangular matrix B. © 2010 Miskolc University Press.