“…But in general, s-convergent sequences satisfy many of the properties of ordinary convergent sequences in metric spaces. It has been discussed and developed by many authors [3,5,6,9,10,11,21,22,25,26].…”
Abstract. In this paper, we introduce the concept ss-sequentially quotient mapping. Using this concept, we characterize s-Fréchet-Urysohn spaces and s-sequential spaces.Finally, we develop the properties of I-Fréchet-Urysohn spaces which is the generalized form of s-Fréchet-Urysohn spaces. Also, we give an example that product of two I-Fréchet-Urysohn spaces need not be an I-Fréchet-Urysohn space for any I.
“…But in general, s-convergent sequences satisfy many of the properties of ordinary convergent sequences in metric spaces. It has been discussed and developed by many authors [3,5,6,9,10,11,21,22,25,26].…”
Abstract. In this paper, we introduce the concept ss-sequentially quotient mapping. Using this concept, we characterize s-Fréchet-Urysohn spaces and s-sequential spaces.Finally, we develop the properties of I-Fréchet-Urysohn spaces which is the generalized form of s-Fréchet-Urysohn spaces. Also, we give an example that product of two I-Fréchet-Urysohn spaces need not be an I-Fréchet-Urysohn space for any I.
“…Later this notion has been studied by Šalát [9], Fridy [3], [4], Connor [1] and so on. Recently, Pehlivan and Mamedov [7] have proved that all optimal paths have the same unique statistical cluster point which is also a statistical limit point. In [8] these concepts were used in Turnpike theory as an application.…”
“…This concept become useful tool for some fundamental subjects of mathematics the last half of the century such as number theory [4], [5], trigono-metric series [6], summability theory [7], measure theory [8], optimization theory [9] and approximation theory [10]. Fridy progressed with the concept of statistically Cauchy sequence in [2] and proved that it is equivalent to statistical convergence.…”
This paper is concerned with the giving a generalization of statistically limit inferior and statistically limit superior defined in [15]. Properties of ∆-limsup →∞ ( ) and ∆-liminf →∞ ( ) is given for a function defined on time scale .
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