Hasbaia, Kaddour2020-10-182020-10-182020http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/19959In this memory, we first studied some concepts of classical sets, then fuzzy sets and operations on them. Second, we studied triangular norm, triangular conorm with presenting important properties and results for these concepts. Third, we touched on two types of relationships: classical and fuzzy relationships with mentioning the most important characteristics and results. Finally, we introduced the concept of fuzzy lattice, where we studied the classical lattice, ideals and filters, as well as a study of its various advantages and characteristics, then we expanded it on the fuzzy lattice, where we presented important characteristics of these concepts.enFuzzy set, Fuzzy complement, Fuzzy partition, Cartesian product, Fuzzy Relation, Fuzzy Lattice, filter, ideal, lattices homomorphism.Thesis