Abstract

In this paper, we introduce a new class of fuzzy sets, namely, fuzzy ψ*-closed sets for fuzzy topological spaces, and some of their properties have been proved. Further, we introduce fuzzy ψ*-continuous, fuzzy ψ*-irresolute functions, and fuzzy ψ*-closed (open) functions, as applications of these fuzzy sets, fuzzy T1/5-spaces, fuzzy {T}_{1/5}^{psi ast } -spaces, and fuzzy ψ*T1/5-spaces.

Highlights

  • Zadeh [1] introduced the fundamental concept of fuzzy sets and fuzzy set operations in 1965

  • Many researchers have worked on various basic concepts from general topology using fuzzy sets and developed the theory of fuzzy topological spaces [3,4,5,6,7]

  • Fuzzy ψ*-continuous and fuzzy ψ*-irresolute functions in FTS As application of fuzzy ψ*-closed set, we identify some types of fuzzy functions and introducing some of their properties

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Summary

Introduction

Zadeh [1] introduced the fundamental concept of fuzzy sets and fuzzy set operations in 1965. In the “Fuzzy ψ*-closed sets in fts” section, we introduce the definition of fuzzy ψ*-closed sets in fuzzy topological spaces and proved some of their properties. Definition 2.2 A fuzzy set D of a fts G is called fuzzy generalized α-closed (briefly, Fgα-closed) [8] if αcl(D) ≤ U whenever D ≤ U and U is fuzzy α-open in (G, τ). Definition 3.1 A fuzzy set D in (G, τ) is called fuzzy ψ*-closed (Fψ*-closed) if αcl(D) ≤ U whenever D ≤ U and U is Fgα-open in (G, τ).

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