Jun, Young Bae; Hong, Sung Ming Interval-valued fuzzifications of subalgebras in BCH-algebras. (English) Zbl 0995.06008 J. Fuzzy Math. 9, No. 3, 625-635 (2001). A BCH-algebra is a binary groupoid \(G\) with a fixed element \(0\) such that the axioms \(xx=0\), \((xy)z=(xz)y\), \(xy=yx=0\to x=y\) are satisfied. A characterization of interval-valued fuzzy subalgebras of \(G\) is given and a method for constructing a new interval-valued fuzzy subalgebra from an old one is presented. The images and inverse images of such fuzzy subalgebras are studied too. Reviewer: Wiesław A.Dudek (Wrocław) MSC: 06F35 BCK-algebras, BCI-algebras (aspects of ordered structures) Keywords:BCH-algebra; interval-valued fuzzy set PDF BibTeX XML Cite \textit{Y. B. Jun} and \textit{S. M. Hong}, J. Fuzzy Math. 9, No. 3, 625--635 (2001; Zbl 0995.06008)