Elsevier

Fuzzy Sets and Systems

Volume 182, Issue 1, 1 November 2011, Pages 37-52
Fuzzy Sets and Systems

Regularity and normality of (L,M)-Fuzzy topological spaces

https://doi.org/10.1016/j.fss.2010.07.008Get rights and content

Abstract

In this paper, regularity and normality axioms are introduced in (L,M)-fuzzy topological spaces where L and M are completely distributive lattices with order-reversing involution. Each (L,M)-fuzzy topological space can be regarded to be regular and normal to some degree. The relations among the four separation axioms are investigated. They are equivalent to each other in an (L,M)-fuzzy metric space.

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      To reflect the characteristics of pointwise L-topology—that is, the relation between a fuzzy point and its Q-neighborhoods (or remote neighborhoods) [26,44]—the notion of pointwise metrics was introduced in L-fuzzy set theory and in fuzzy lattices [32–34], which is not equivalent to Deng's definition [3] and Erceg's definition [4]. Many ideal results for the general topology were generalized to L-topology and LM-fuzzy topology [35,37,38,47]. In this article, our aim is to construct a natural L-topology on the set of L-fuzzy numbers, which is called a standard L-topology.

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    The project is supported by the National Natural Science Foundation of China (10971242).

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