Ara es mostren els items 59-78 de 109

    • La Hoja de cálculo : un entorno para la enseñanza y estudio de relaciones borrosas 

      Casabó Gispert, Jorge Enrique; Jacas Moral, Juan; Recasens Ferrés, Jorge (Center for Soft Computing, 2008)
      Text en actes de congrés
      Accés obert
      En este trabajo se estudia la posibilidad de introduir conceptos de teoría de conjuntos borrosos en los currículos correspondientes a distintos niveles de enseñanza. Se hace especial hincapié en la enseñanza de las relaciones ...
    • Lower Approximations by Fuzzy Consequence Operators 

      Elorza Barbajero, Jorge; Recasens Ferrés, Jorge (Atlantis Press, 2015)
      Comunicació de congrés
      Accés obert
    • Maps and isometries between indistinguishability operators 

      Jacas Moral, Juan; Recasens Ferrés, Jorge (2002-02)
      Article
      Accés restringit per política de l'editorial
      In this paper, some geometric aspects of indistinguishability operators are studied by using the concept of morphism between them. Among all possible types of morphisms, the paper is focused on the following cases: Maps ...
    • Maximal fuzzy maps 

      Recasens Ferrés, Jorge (2009-01)
      Article
      Accés restringit per política de l'editorial
      Fuzzy maps are studied by stressing the idea that they are respectful with granularity when it is modeled by the existence of fuzzy equivalence relations (indistinguishability operators). The granules of the system are ...
    • Modelling a linguistic variable as a hierarchical family of partitions induced by an indistinguishability operator 

      Soto, De A R; Recasens Ferrés, Jorge (2001-08)
      Article
      Accés restringit per política de l'editorial
      This work shows a method to obtain a hierarchy of partitions on the universe [0,1] in such a way that each of them is compatible with a refinement of Lukasiewicz indistinguishability operator. The classes of the partition ...
    • Normalizing possibility distributions using t-norms 

      Recasens Ferrés, Jorge; Lawry, J (2003-06)
      Article
      Accés restringit per política de l'editorial
      A new approach to normalizing fuzzy sets is introduced where it is assumed that the normalization method is compatible with a given t-norm. In this context it is proved that the most usual ways to normalize fuzzy subsets ...
    • On a conjecture concerning positive semi-definiteness 

      Recasens Ferrés, Jorge (2019-01-01)
      Article
      Accés obert
      In [7] a conjecture relating the positive definiteness of a similarity with its transitivity with respect to the Lukasiewicz t-norm is made. In its current form, the conjecture is not true but from a modified version ...
    • On a geometric combinatorial problem 

      Recasens Ferrés, Jorge (1998-09)
      Article
      Accés restringit per política de l'editorial
      The study of the betweenness relations defined by metrics leads to a geometric problem that yields an upper bound to Turán's number T(n,5,3).
    • On possibilistic and probabilistic approximations of unrestricted belief functions based on the concept of fuzzy T-preorder 

      Hernández, E; Recasens Ferrés, Jorge (2002-06)
      Article
      Accés restringit per política de l'editorial
      This paper presents a new method for approximating an unrestricted belief measure assuring that the "order" defined by the compatibility degree between evidence and the singletons set is preserved. Our approach, based on ...
    • On the degree of transitivity of a fuzzy relation 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2021-01-01)
      Article
      Accés obert
      Considering a family generated from a t-norm T, the degree of T-transitivity of a fuzzy relation R is revisited and proved to coincide with the greatest c for which R is -transitive. This fact gives rise to the study of ...
    • On the Induction of New Fuzzy Relations, New Fuzzy Operators and Their Aggregation 

      Carmona Cervelló, Neus; Elorza, Jorge; Recasens Ferrés, Jorge; Bragard, Jean (Springer, 2013)
      Article
      Accés obert
      In this paper we generate fuzzy relations and fuzzy operators using different kind of generators and we study the relationship between them. Firstly, we introduce a new fuzzy preorder induced by a fuzzy operator. We ...
    • On the relationship between fuzzy subgroups and indistinguishability operators 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-09-06)
      Article
      Accés obert
      Fuzzy subgroups are revisited considering their close relationship with indistinguishability operators (fuzzy equivalences) invariant under translations. Different ways to obtain new fuzzy subgroups from a given one are ...
    • On the relationship between positive semi-definite matrices and t-norms 

      Recasens Ferrés, Jorge (2021-01-01)
      Article
      Accés restringit per política de l'editorial
      t-norms and t-conorms are the natural connectives “and” and “or” in fuzzy logic. The unit interval with a t-norm or a t-conorm is a special monoid and some submonoids like discrete t-norms and t-conorms have been proved ...
    • On the representation of local indistinguishability operators 

      Calvo Sánchez, Tomasa; Recasens Ferrés, Jorge (2021-05-01)
      Article
      Accés obert
      This paper studies local indistinguishability operators, i.e., symmetric and transitive fuzzy relations that do not need to be reflexive. This is an important generalization of global indistinguishability relations (fuzzy ...
    • One dimensional indistinguishability operators 

      Jacas Moral, Juan; Recasens Ferrés, Jorge (2000-02)
      Article
      Accés restringit per política de l'editorial
      The main result of the paper is an algorithm that allows us to decide when a given fuzzy relation is a one-dimensional T-indistinguishability operator for some archimedean t-norm T (in the sense of the Representation Theorem ...
    • One-dimensional T-preorders 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IOS Press, 2014)
      Text en actes de congrés
      Accés obert
      This paper studies T-preorders by using their Representation Theorem that states that every T-preorder on a set X can be generated in a natural way by a family of fuzzy subsets of X. Especial emphasis is made on the study ...
    • Operadores de T-indistinguibilidad respecto a sumas ordinales 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2014)
      Text en actes de congrés
      Accés obert
      En este trabajo se estudia la clase de operadores de T-indistinguibilidad con T una suma ordinal. Mostramos que estos operadores de T-indistinguibilidad pueden pensarse como familias de operadores de indistinguibilidad ...
    • Órdenes parciales para hesitant fuzzy sets 

      Garmendia Salvador, Luis; González del Campo, Ramón; Recasens Ferrés, Jorge (2016)
      Text en actes de congrés
      Accés obert
      Se define un nuevo orden parcial H en el conjunto H de subconjuntos finitos del intervalo unidad. Con este preorden H no es un retículo, pero sí lo son algunos subconjuntos de H interesantes. H se puede inyectar de forma ...
    • Partial orderings for hesitant fuzzy sets 

      Garmendia Salvador, Luis; González del Campo, Ramón; Recasens Ferrés, Jorge (2017-05-01)
      Article
      Accés obert
      New partial orderings =o=o, =p=p and =H=H are defined, studied and compared on the set HH of finite subsets of the unit interval with special emphasis on the last one. Since comparing two sets of the same cardinality is a ...
    • Permutability of fuzzy consequence operators and fuzzy interior operators 

      Carmona, Neus; Elorza, Jorge; Recasens Ferrés, Jorge; Bragard, Jean (2013)
      Article
      Accés restringit per política de l'editorial
      In this paper we study the permutability of the composition of fuzzy consequence operators (fuzzy closings) and fuzzy interior operators (fuzzy openings). We establish several characterizations and we show the relation of ...