2015
DOI: 10.1016/j.topol.2015.05.074
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Sequentially compact subsets and monotone functions: An application to fuzzy theory

Abstract: Abstract. Let (X, <, τ O ) be a first countable compact linearly ordered topological space. If (Y, D) is a uniform sequentially compact linearly ordered space with weight less than the splitting number s, then we characterize the sequentially compact subsets of the space M(X, Y ) of all monotone functions from X into Y endowed with the topology of the uniform convergence induced by the uniformity D. In particular, our results are applied to identify the compact subsets of M ([0, 1], Y ) for a wide class of lin… Show more

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Cited by 5 publications
(9 citation statements)
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“…In [14,Theorem 4.2], Fang and Xue set up a fuzzy version of Ascoli theorem which characterized compact subsets of the space C(K, (E 1 , d ∞ )) of all fuzzy-valued continuous functions on a compact metric space K endowed with the topology of the uniform convergence. Unfortunately this version is not correct since, as pointed out in [15], it is based on a wrong characterization ( [14,Theorem 2.4]) of the compact subsets of (E 1 , d ∞ ). In the last section of this paper we fix [14,Theorem 4.2] by extending the fuzzy Ascoli theorem to a broader framework.…”
Section: Introductionmentioning
confidence: 99%
“…In [14,Theorem 4.2], Fang and Xue set up a fuzzy version of Ascoli theorem which characterized compact subsets of the space C(K, (E 1 , d ∞ )) of all fuzzy-valued continuous functions on a compact metric space K endowed with the topology of the uniform convergence. Unfortunately this version is not correct since, as pointed out in [15], it is based on a wrong characterization ( [14,Theorem 2.4]) of the compact subsets of (E 1 , d ∞ ). In the last section of this paper we fix [14,Theorem 4.2] by extending the fuzzy Ascoli theorem to a broader framework.…”
Section: Introductionmentioning
confidence: 99%
“…El teorema anterior relaciona el estudio de los números difusos con el estudio de funciones monótonas. En este contexto, pueden ser de interés las técnicas desarrolladas en [28,62].…”
Section: Teorema De Representación De Goetschel Y Voxmanunclassified
“…Así pues, en [22, Theorem 4.2], Fang y Xue prueban una versión difusa del teorema de Ascoli que caracteriza los subconjuntos compactos del espacio C(K, (E 1 , d ∞ )) de todas las funciones difusas continuas definidas en un espacio métrico compacto K dotado con la topología de la convergencia uniforme. Lamentablemente, esta versión no es correcta ya que, como se indica en [28], se basa en una caracterización incorrecta ([22, Theorem 2.4]) de los subconjuntos compactos de (E 1 , d ∞ ). En la sección 4.4, corregimos [22, Theorem 4.2] ampliando el teorema de Ascoli difuso a un marco más general.…”
Section: Capítulo 4 Completitud Metrizabilidad Y Compacidad En Espacunclassified
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