RT Journal Article T1 Fuzzy algebras of concepts A1 Ojeda Hernández, Manuel A1 López-Rodríguez, Domingo A1 Cordero-Ortega, Pablo K1 Algebra K1 Disfusiones AB Preconcepts are basic units of knowledge that form the basis of formal concepts in formal concept analysis (FCA). This paper investigates the relations among different kinds of preconcepts, such as protoconcepts, meet and join-semiconcepts and formal concepts. The first contribution of this paper, is to present a fuzzy powerset lattice gradation, that coincides with the preconcept lattice at its 1-cut. The second and more significant contribution, is to introduce a preconcept algebra gradation that yields different algebras for protoconcepts, semiconcepts, and concepts at different cuts. This result reveals new insights into the structure and properties of the different categories of preconcepts. PB MDPI YR 2023 FD 2023-03-26 LK https://hdl.handle.net/10630/26994 UL https://hdl.handle.net/10630/26994 LA eng NO Ojeda-Hernández M, López-Rodríguez D, Cordero P. Fuzzy Algebras of Concepts. Axioms. 2023; 12(4):324. https://doi.org/10.3390/axioms12040324 NO Partial funding for open access charge: Universidad de Málaga DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 20 ene 2026