Neighborhood systems in fuzzy topological group
Considering Warren neighborhood systems [\textit{R. H. Warren}, Rocky Mountain J. Math. 8, No. 3, 459-470 (1978; Zbl 0394.54003)], the authors establish a necessary and sufficient condition for a familiy of fuzzy sets in a group to be a family of neighborhoods of the identity element of a fuzzy topological group. As an application, a result on so-called mixed fuzzy topological groups is obtained.
scientific article; zbMATH DE number 1563565