Affiliations: [a]
Department of Mathematics, Ilam University, Ilam, Iran
| [b]
Department of Mathematics, Fasa University, Fasa, Iran
| [c]
Department of Mathematics, Payame Noor University, Tehran, Iran
Correspondence:
[*]
Corresponding author. S. Khosravi Shoar, Department of Mathematics, Fasa University, Fasa, Iran. Tel.: +987153344748; Fax: +987153343848; E-mail: khosravi.shoar@fasau.ac.ir.
Abstract: In this paper by considering of congruence relations induced by fuzzy ideals, we study rough sets in BCK-algebras. To this purpose we clarify a lower and upper approximations for any subset of X in this algebras. Finally, lower and upper rough ideals with respect to fuzzy ideal μ of X are discussed.
Keywords: Fuzzy ideal, lower and upper approximation, regular congruence relation, rough ideal, rough set
