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Spaces not distinguishing pointwise and -quasinormal convergence

Pratulananda DasDebraj Chandra — 2013

Commentationes Mathematicae Universitatis Carolinae

In this paper we extend the notion of quasinormal convergence via ideals and consider the notion of -quasinormal convergence. We then introduce the notion of Q N ( w Q N ) space as a topological space in which every sequence of continuous real valued functions pointwise converging to 0 , is also -quasinormally convergent to 0 (has a subsequence which is -quasinormally convergent to 0 ) and make certain observations on those spaces.

On some consequences of a generalized continuity

Pratulananda DasEkrem Savaş — 2014

Archivum Mathematicum

In normed linear space settings, modifying the sequential definition of continuity of an operator by replacing the usual limit " lim " with arbitrary linear regular summability methods 𝐆 we consider the notion of a generalized continuity ( ( 𝐆 1 , 𝐆 2 ) -continuity) and examine some of its consequences in respect of usual continuity and linearity of the operators between two normed linear spaces.

Two valued measure and summability of double sequences

Pratulananda DasSantanu Bhunia — 2009

Czechoslovak Mathematical Journal

In this paper, following the methods of Connor [], we extend the idea of statistical convergence of a double sequence (studied by Muresaleen and Edely []) to μ -statistical convergence and convergence in μ -density using a two valued measure μ . We also apply the same methods to extend the ideas of divergence and Cauchy criteria for double sequences. We then introduce a property of the measure μ called the (APO 2 ) condition, inspired by the (APO) condition of Connor []. We mainly investigate the interrelationships...

g * -closed sets and a new separation axiom in Alexandroff spaces

Pratulananda DasMd. Mamun Ar Rashid — 2003

Archivum Mathematicum

In this paper we introduce the concept of g * -closed sets and investigate some of its properties in the spaces considered by A. D. Alexandroff [1] where only countable unions of open sets are required to be open. We also introduce a new separation axiom called T w -axiom in the Alexandroff spaces with the help of g * -closed sets and investigate some of its consequences.

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