Acta Mathematica Hungarica
Volume/Issue:
Volume 130: Issue 1-2
Two valued measure and summability of double sequences in asymmetric context
Authors: Santanu Bhunia 1 and Pratulananda Das 2
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  • 1 Department of Mathematics, F. C. College, Diamond Harbour, South 24 Prgs., Pin 743331, West Bengal, India
  • 2 Department of Mathematics, Jadavpur University, Kolkata 700032, West Bengal, India
DOI:
https://doi.org/10.1007/s10474-010-0005-y
Page Count:
167–187
Publication Date:
01 Jan 2011
Online Publication Date:
03 Nov 2010
Article Category:
Research Article
Restricted access

Abstract

We extend the ideas of convergence and Cauchy condition of double sequences extended by a two valued measure (called μ-statistical convergence/Cauchy condition and convergence/Cauchy condition in μ-density, studied for real numbers in our recent paper [7]) to a very general structure like an asymmetric (quasi) metric space. In this context it should be noted that the above convergence ideas naturally extend the idea of statistical convergence of double sequences studied by Móricz [15] and Mursaleen and Edely [17]. We also apply the same methods to introduce, for the first time, certain ideas of divergence of double sequences in these abstract spaces. The asymmetry (or rather, absence of symmetry) of asymmetric metric spaces not only makes the whole treatment different from the real case [7] but at the same time, like [3], shows that symmetry is not essential for any result of [7] and in certain cases to get the results, we can replace symmetry by a genuinely asymmetric condition called (AMA).

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Cover Acta Mathematica Hungarica
Acta Mathematica Hungarica
Print ISSN:
0236-5294
Online ISSN:
1588-2632
Keywords:
asymmetric metric space; approximate metric axiom (AMA); double sequences; forward and backward μ-statistical convergence/divergence/Cauchy condition; convergence/divergence/Cauchy condition in μ-density; condition (APO2); 40A30; 40A05

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