Abstract
In three-way decision theory, three disjoint sets covering a given universe, are determined: the positive, negative, and boundary regions. They correspond to three types of decisions on their objects: acceptance, rejection, and abstention or non-commitment. A linguistic approach for identifying the three regions relies on specific evaluative linguistic expressions, such as “very big”, “roughly small”, “not small”, “medium”, and so forth.
In this article, we construct hexagons of opposition using the regions generated by different evaluative linguistic expressions. Then, we explore the logical relations between the vertices of different hexagons.
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Notes
- 1.
The function such that \(X \mapsto \dfrac{|X|}{|U|}\) for each \(X \subseteq U\) is understood as a normalized fuzzy measure [17].
- 2.
This is a fuzzy quantifier \(\mathcal {S}_{many}\) assigning a value of [0,1] to each pair of fuzzy sets. In [6], it has been proven that \(\mathcal {S}_{many}(A,B)=\lnot Sm\left( \dfrac{|A \cap B|}{|A|}\right) \), when A and B are classical set of the given universe.
- 3.
By a tri-partition of U we mean a collection of three mutually disjoint subsets covering U. So, notice that the limit cases where one or two sets are empty are included.
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Boffa, S., Ciucci, D. (2023). Hexagons of Opposition in Linguistic Three-Way Decisions. In: Campagner, A., Urs Lenz, O., Xia, S., Ślęzak, D., Wąs, J., Yao, J. (eds) Rough Sets. IJCRS 2023. Lecture Notes in Computer Science(), vol 14481. Springer, Cham. https://doi.org/10.1007/978-3-031-50959-9_9
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