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In this paper, by using operations, some characterizations and some properties of fuzzy lower and upper continuous mul-tifunctions and its weaker and stronger forms including fuzzy lower and upper weakly continuous, fuzzy lower and upper θ-continuous, fuzzy lower and upper strongly θ-continuous, fuzzy lower and upper almost strongly θ-continuous, fuzzy(More)
Erdal Ekici has introduced and studied nearly continuous multifunctions [Acta Math. Univ. Comenianae, Vol. LXXII, 2 (2003), pp. 1–7]. The purpose of the present paper is to introduce and study upper and lower almost nearly continuous multifunctions as a weaker form of upper and lower nearly continuous multifunctions. Basic characterizations, several(More)
In [2], Arhangel'ski˘ ı introduced the notion of ω-closed sets in relation to countable tightness. This paper deals with a class of sets called ω *-closed sets and its topology which is stronger than the class of ω-closed sets due to Arhangel'ski˘ ı. The word tightness was first introduced in [1]. In [2], Arhangel'ski˘ ı introduced the notions of "(More)
In this paper, the concept of completely N-continuous multifunction is defined and their basic characterizations and properties are obtained. Resumen En este artículo se define el concepto de multifunción completamente N-continua y se obtienen su caracterización y propiedades básicas. Palabras y frases clave: N-continuidad completa, multifunción.