Öner, TahsinJun, Young BaeKatıcan TuğçeSaeid, Arsham Borumand2023-09-112023-09-1120231793-00571793-7027https://doi.org/10.1142/S1793005724500169https://hdl.handle.net/20.500.14365/4808Article; Early AccessThe notions of intuitionistic fuzzy quasi-subalgebras and intuitionistic fuzzy (ultra) filters are defined and examined on Sheffer stroke BL-algebras in detail. Then we characterize the properties of these intuitionistic fuzzy structures, and show the relationships between intuitionistic fuzzy quasi-subalgebras and intuitionistic fuzzy (ultra) filters. Also, it is stated that the affiliations between aforementioned intuitionistic fuzzy structures and ordinary fuzzy structures on Sheffer stroke BL-algebras, and that the upper and lower level sets defining intuitionistic fuzzy (ultra) filters are (ultra) filters on these algebraic structures. At the end of the study, the process of building new intuitionistic fuzzy filters is presented by means of homomorphisms of Sheffer stroke BL-algebras.eninfo:eu-repo/semantics/closedAccessSheffer stroke BL-algebraquasi-subalgebra(ultra) filterintuitionistic fuzzy quasi-subalgebraintuitionistic fuzzy (ultra) filterFILTERSArticle10.1142/S17930057245001692-s2.0-85165462127