Rodríguez González, Juan TinguaroFranco De Los Ríos, Camilo A.Gómez González, DanielMontero De Juan, Francisco JavierKrassimir T., AtanassovCastillo, OscarKacprzyk, JanuszKrawczak, MaciejMelin, PatriciaSotirov, SotirSotirova, EvdokiaSzmidt, EulaliaDe Tré, GuyZadrozny, Slawomir2023-06-182023-06-182016Tinguaro Rodríguez, J., Franco, C., Gómez, D., Montero, J.: Paired Structures, Imprecision Types and Two-Level Knowledge Representation by Means of Opposites. En: Atanassov, K.T., Castillo, O., Kacprzyk, J., Krawczak, M., Melin, P., Sotirov, S., Sotirova, E., Szmidt, E., De Tré, G., y Zadrożny, S. (eds.) Novel Developments in Uncertainty Representation and Processing. pp. 3-15. Springer International Publishing, Cham (2016)978-3-319-26211-610.1007/978-3-319-26211-6_1https://hdl.handle.net/20.500.14352/24707Opposition-based models are a current hot-topic in knowledge representation. The point of this paper is to suggest that opposition can be in fact introduced at two different levels, those of the predicates of interest being represented (as short/tall) and of the logical references (true/false) used to evaluate the verification of the former. We study this issue by means of the consideration of different paired structures at each level. We also pay attention at how different types of fuzziness may be introduced in these paired structures to model imprecision and lack of knowledge. As a consequence, we obtain a unifying framework for studying the relationships between different knowledge representation models and different kinds of uncertainty.book parthttps//doi.org/10.1007/978-3-319-26211-6_1http://link.springer.com/chapter/10.1007/978-3-319-26211-6_1metadata only access519.8Intuitionistic fuzzy setsBipolar fuzzy setsPaired fuzzy setsInvestigación operativa (Matemáticas)1207 Investigación Operativa