Kiss, A. An application of fuzzy graphs in database theory. (English) Zbl 0736.68023 PU.M.A., Pure Math. Appl., Ser. A 1, No. 3-4, 337-342 (1990). Summary: This paper shows a natural extension of data dependencies of relational databases to fuzzy relational databases. We define the truth value of a functional dependency in a fuzzy relational database and some of its properties are shown. The truth value determines its closure, which is a fuzzy relation on \(U^ 2\). This defines a closure on fuzzy subsets of \(U\). An algorithm, using fuzzy graphs is given to compute the closure. Cited in 3 Documents MSC: 68P15 Database theory 94D05 Fuzzy sets and logic (in connection with information, communication, or circuits theory) Keywords:fuzzy relational databases; truth value; functional dependency PDFBibTeX XMLCite \textit{A. Kiss}, PU.M.A., Pure Math. Appl., Ser. A 1, No. 3--4, 337--342 (1990; Zbl 0736.68023)