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The concept of a fuzzy set was introduced by Zadeh. Since the theory has developed in many directions. The kind of fuzzy set have gained wide recognition as a useful tool in the modeling of some uncertain phenomena. these have numerous applications such as computer science, mathematical applied and medicine. The elements of the fuzzy sets are featured by an additional degree which is called the degree of uncertainty. The aim of this book is to introduce new notions of (fuzzy) n-fold ideals, (fuzzy) n-fold weak ideals in BCK/BCI-algebras and investigate several properties of the foldness...

The study of BCK/BCI-algebras was initiated by Iséki to generalize the concept of set-theoretic difference and propositional calculus. Since then, a great deal of theorems has been produced on the theory of BCK/BCI-algebras. In(1965) Zadeh has introduced the notion of a fuzzy subset of a set as a method for representing uncertainty. In 1991, Xi defined fuzzy subsets in BCK/BCI-algebras. In 2020Muhiuddin and Jun gave Further Results of Neutrosophic subalgebras in BCK/BCI -algebras based on Neutrosophic points. In 2019 Muhiuddin, Kim, and Jun defined Implicative N - ideals of BCK - algebras...