Interval-valued picture fuzzy sets in UP-algebras
Nattacha Lapo, Pimwaree Kankaew, Sunisa Yuphaphin, Ronnason Chinram, Aiyared Iampan · Journal of Interdisciplinary Mathematics · 2023
We used the notion of interval-valued picture fuzzy sets (IvPFSs) in UP-algebras to introduce the eight new notions of IvPFSs. We also discuss about how the eight new notions of IvPFSs in UP-algebras relate to each other. This idea is extended to level subsets of IvPFSs in UP-algebras. Furthermore, we define an IvPFS in the same manner that a characteristic function is defined, and we examine its characterizations using the associated subset.