Saad et Mahdid, Mohamed et Abdelaziz2020-10-112020-10-112020http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/19742In this memory, we have studied the concept of a fuzzy ideal on a ring as a generalization of crisp ideal on a ring. Moreover, we studied two types of these ideals which are fuzzy prime ideals and fuzzy maximal ideals, and relationship between them.enFuzzy set, Ring, Fuzzy ideal, Prime fuzzy ideal, Maximal fuzzy ideal.Thesis