Functions with closed graphs and strongly closed graphs in fuzzy neighbourhood spaces (Q1197854)

Within the framework of fuzzy neighborhood spaces [\textit{R. Lowen}, ibid. 7, 165-189 (1982; Zbl 0487.54008)], the authors considered various types of closed graphs, such as \(N\)-closed graph, \(N\)-strongly closed graph, weakly \(N\)-closed graph, and weakly \(N\)-strongly closed graph and poved that all of these notions are good extensions in the sense of Lowen. Some characterizations are produced in the presence of Wuyts-Lowen lower separation axioms [J. Math. Anal. Appl. 93, 27-41 (1983; Zbl 0515.54004)].