Yazar "Jafari, Saeid" seçeneğine göre listele

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    On a new topology and decompositions of continuity
    (Nova Science Publishers, Inc., 2011) Ekici, Erdal; Jafari, Saeid
    In this paper, we introduce and investigate a new class of sets called ?*-open sets. It turns out that this class of sets establishes a topology. We also study some of the basic properties of some new classes of continuous functions. Moreover, we offer new decompositions of ?*-continuity and super-continuity. © 2011 by Nova Science Publishers, Inc. All rights reserved.
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    On a new weaker form of Popa's rare continuity via ?-open sets
    (Academic Publication Council, 2009) Ekici, Erdal; Jafari, Saeid
    In 1979, Popa introduced the notion of rare continuity as a generalization of weak continuity. The objective of this paper is to introduce a new generalization of rare continuity called rare lambda-continuity and investigate some of its fundamental properties.
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    On a weaker form of ?-continuity
    (Univ Craiova, 2010) Ekici, Erdal; Jafari, Saeid; Moshokoa, Seithuti P.
    In [5], Hdeib introduced and investigated a new type of continuity called omega-continuity. In [1], Al-Omari and Noorani have introduced the notion of almost weak omega-continuity. It is the objective of this paper to study almost weak omega-continuity and present some of its basic properties.
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    On A Weaker Form Of Complete Irresoluteness
    (Soc Paranaense Matematica, 2008) Ekici, Erdal; Jafari, Saeid
    The aim of this paper is to present a new class of complete irresoluteness. The notion of completely delta-semi-irresolute functions is introduced and studied.
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    ON DS*-SETS AND DECOMPOSITIONS OF CONTINUOUS FUNCTIONS
    (Univ Nis, Fac Sci Math, 2008) Ekici, Erdal; Jafari, Saeid
    In this paper, the notions of DS*-sets and DS*-continuous functions are introduced and their properties and their relationships with some other types of sets are investigated. Moreover, some new decompositions of continuous functions are obtained by using DS*-continuous functions, DS-continuous functions and D-continuous functions.
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    On generalized pre-closure spaces and separation for some special types of functions
    (2010) Miguel, Caldas; Erdal, Ekici; Jafari, Saeid
    In this paper, we show that a pointwise symmetric pre-isotonic pre-closure functions is uniquely determined by the pairs of sets it separates. We then show that when the pre-closure function of the domain is pre-isotonic and the pre-closure function of the codomain is pre-isotonic and pointwise-pre- symmetric, functions which separate only those pairs of sets which are already separated are pre-continuous.
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    ON GENERALIZED PRE-CLOSURE SPACES AND SEPARATION FOR SOME SPECIAL TYPES OF FUNCTIONS
    (Forum Editrice Univ Udinese, 2010) Caldas, Miguel; Ekici, Erdal; Jafari, Saeid
    In this paper, we show that a pointwise symmetric pre -isotonic pre -closure functions is uniquely determined by the pairs of sets it separates. We then show that when the pre -closure function of the domain is pre -isotonic and the pre -closure function of the codomain is pre -isotonic and pointwise-pre-symmetric, functions which separate only those pairs of sets which are already separated are pre -continuous.
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    On rare s-precontinuity for multifunctions
    (Warsaw University, 2013) Ekici, Erdal; Jafari, Saeid
    In this paper, we introduce and study the notions of upper and lower rarely s-precontinuous multifunctions which are a generalization of weakly s-precontinuous multifunctions due to Ekici and Park [3].
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    ON RARE s-PRECONTINUITY FOR MULTIFUNCTIONS
    (De Gruyter Open Ltd, 2013) Ekici, Erdal; Jafari, Saeid
    In this paper, we introduce and study the notions of upper and lower rarely s-precontinuous multifunctions which are a generalization of weakly s-precontinuous multifunctions due to Ekici and Park [3]
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    ON UPPER AND LOWER CONTRA-CONTINUOUS MULTIFUNCTIONS
    (Univ Al I Cuza, Fac Math, 2008) Ekici, Erdal; Jafari, Saeid; Noiri, Takashi
    In 1996, DONTCHEV [4] introduced and investigated the notion of contra-continuity. In this paper we introduce and study the basic properties of upper (lower) contra-continuous multifunctions.
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    On weakly BR-closed functions between topological spaces
    (Univ Osijek, Dept Mathematics, 2009) Caldas, Miguel; Ekici, Erdal; Jafari, Saeid; Moshokoa, Seithuti P.
    In this paper, we offer a new class of functions called weakly BR-closed functions. Moreover, we investigate not only some of their basic properties but also their relationships with other types of already well-known functions.