Scielo RSS <![CDATA[Proyecciones (Antofagasta)]]> vol. 33 num. 3 lang. en <![CDATA[SciELO Logo]]> <![CDATA[<b>Statistically pre-Cauchy Fuzzy real-valued sequences defined by Orlicz function</b>]]> In this article we have defined statistically pre-Cauchy sequence of fuzzy real numbers defined by Orlicz function. We have proved a necessary and sufficient condition for a sequence X =(Xk) of fuzzy real numbers to be statistically pre-Cauchy. We have also established some other results. <![CDATA[<b>On</b> (γ, δ) -Bitopological semi-closed set via topological ideal]]> In this paper we introduce a new class of generalized closed sets in bitopological space using local function, two extension operators and semi-open sets. We have also investigated some properties in subspace bitopology defining kernel and image. <![CDATA[<b>On Zweier I-convergent sequence spaces</b>]]> In this article we introduce the Zweier I-convergent sequence spaces Z¹, ZQ and Z¹00. We prove the decomposition theorem and study topo-logical, algebraic properties and have established some inclusion relations of these spaces. <![CDATA[<b>On /-statistically convergent sequence spaces defined by sequences of Orlicz functions using matrix transformation</b>]]> Recently Savas and Das [12] introduced the notion of I-statistical convergence of sequences of real numbers. In this article we introduced the sequence spaces W I(S) (M, A, p), W0¹ (S) (M, A, p) and WÍ(S) (M, A, p) of real numbers defined by /-statistical convergence using sequences of Orlicz function.We study some basic topological and algebraic properties of these spaces. We investigate some inclusion relations involving these spaces. <![CDATA[<b>Classes de </b>(≤ 3,ω,ω*,Ω, Ω∗)<b>-hypomorphie infinies</b>]]> Cet articlese veutune suite a [23] puisque apres l'etude des classes de (<3)-hypomorphie aiaquelleest consacree [23] nous allons etudier les classes d'hypomorphie infinies avec des conditions d'hypomorphie infinie. Nous y utiliserons aussi la notion de pavages mais ceux-ci seront différents de ceux de [23] car la problématique n'est plus la meme. Au passage nous decrirons les classes de (<3,4/2)-hypomorphie. Voir la bibliographie pour d'autres (etudes en rapport avec l'hypomorphie infinie ou finieouaveclaproblematique de la reconstruction qui y est liee. <![CDATA[<b>Generalized</b> b<b>-closed sets in ideal bitopological</b> <b>spaces</b>]]> In this articleweintroduce theconcept of generalized b-closed sets with respect to an ideal in bitopological spaces, which is the extension of the concepts of generalized b-closed sets. <![CDATA[<b>On the qualitative properties of differential equations of third order with retarded argument</b>]]> By using the standard Liapunov-Krasovskii functional approach, in this paper, new stability, boundedness and ultimately boundedness criteria are established for a class of vector functional differential equations of third order with retarded argument