• Extensionality with respect to indistinguishability operators 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-04-01)
      Article
      Accés obert
      Extensionality is explored form different points of view. Extensional fuzzy subsets from a fuzzy equivalence relation E are considered as observable subsets with respect to the granularity generated by E. Interestingly, ...
    • Haussdorfness in intutionistic fuzzy topological spaces 

      Gallego Lupiañez, F. (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2003)
      Article
      Accés obert
      The basic concepts of the theory of intuitionistic fuzzy topological spaces have been defined by D. Çcoker and co-workers. In this paper, we define new notions of Hausdorffness in the intuitionistic fuzzy sense, and obtain ...
    • Upper and Lower Approximations of Fuzzy Sets 

      Boixader Ibáñez, Dionís; Jacas Moral, Juan; Recasens Ferrés, Jorge (2000-09)
      Article
      Accés restringit per política de l'editorial
      The upper and lower approximations of a fuzzy subset with respect to an indistinguish-ability operator are studied. Their relations with fuzzy rough sets are also investigated