The Nörlund, Weighted Mean, and $$(M, \lambda _{m,n})$$ Methods for Double Sequences

Abstract

In the context of the new definition of convergence of a double sequence and double series introduced in Chap. 5, we define the Nörlund, the Weighted Mean, and the \((M, \lambda _{m,n})\) or Natarajan methods for double sequences and double series and study some of their properties.