Rough Pythagorean Fuzzy Sets in UP-Algebras
Keywords:UP-algebra, Pythagorean fuzzy set, Upper approximation, Lower approximation, Rough set, Rough Pythagorean fuzzy set, $t$-level subset
This paper aims to apply the concept of rough sets to Pythagorean fuzzy sets in UP-algebras. Then we introduce fifteen types of rough Pythagorean fuzzy sets in UP-algebras and study their generalization. In addition, we will also discuss $t$-level subsets of rough Pythagorean fuzzy sets in UP-algebras to study the relationships between rough Pythagorean fuzzy sets and rough sets in UP-algebras.
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