Ara es mostren els items 21-40 de 45

    • Indistinguishability operators with respect to different t-norms 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2012-04)
      Article
      Accés restringit per política de l'editorial
      An isomorphism f between two continuous Archimedean t-norms T and T′ transforms a T-indistinguishability operator E into a T′-indistinguishability operator f ∘ E and many interesting properties of E are transfered to f ∘ ...
    • Introducing Strong T-transitivity in Approximate Fuzzy Preorders and Equivalences 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (IEEE Computer Society Publications, 2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
    • Logical methods in artificial intelligence applications 

      Armengol Voltas, Eva; Boixader Ibáñez, Dionís; Grimado, Francisco (2017-09-01)
      Article
      Accés obert
    • 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 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 T-transitivity and approximate equality 

      Boixader Ibáñez, Dionís (2003-01)
      Article
      Accés restringit per política de l'editorial
      The paper discusses the suitability of T-transitivity for modelling approximate equality. It explains how T-transitivity, a property suitable for modelling vagueness, can still be used to handle the imprecision inherent ...
    • On the unidimensional fuzzy equivalence relations 

      Boixader Ibáñez, Dionís (Wiley InterScience, 1999-09)
      Article
      Accés restringit per política de l'editorial
      The dimension of a fuzzy equivalence relation is the minimum number of fuzzy sets needed to generate it. A general theorem is proved that characterizes unidimensional fuzzy equivalence relations. The multidimensional case ...
    • 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 ...
    • Powers with respect to t-norms and t-conorms and Aggregation Functions 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Springer, 2016)
      Capítol de llibre
      Accés restringit per política de l'editorial
      Aggregation functions A stable with respect to powers of t-norms and t-conorms (i.e.: satisfying A(x^{(r)},y^{(r)})=(A(x,y))^{(r)}) where x^{(r)} is the r-th power of x \in [0,1] with respect to a t-norm or t-conorm) are ...
    • Problemes i exercicis de Matemàtiques II 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2013)
      Problema, exercici
      Accés obert
    • Reduction of attributes in averaged similarities 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-02-01)
      Article
      Accés obert
      Similarity Relations may be constructed from a set of fuzzy attributes. Each fuzzy attribute generates a simple similarity, and these simple similarities are combined into a complex similarity afterwards. The Representation ...
    • Reflexividad y T-transitividad aproximadas 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2010)
      Text en actes de congrés
      Accés obert
    • Searching for meaning on defuzzification 

      Recasens Ferrés, Jorge; Boixader Ibáñez, Dionís; Jacas Moral, Juan (1999-10)
      Article
      Accés restringit per política de l'editorial
      Defuzzification is an essential problem in fuzzy systems that it is always solved in a heuristic way. The aim of this work is to give a semantic interpretation to this process with the help of indistinguishability operators
    • Some properties concerning the quasi-inverse of a t-norm 

      Boixader Ibáñez, Dionís (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1998)
      Article
      Accés obert
      Some properties of the quasi-inverse operators are presented. They are basic tools in order to reduce complex expressions involving several of such operators. An effective calculation for the quasi-inverse of a continuous ...
    • Some properties concerning the quasi-inverse of a T-norm 

      Boixader Ibáñez, Dionís (1998-02)
      Article
      Accés obert
      Some properties of the quasi-inverse operators are presented. They are basic tools in order to reduce complex expressions involving several of such operators. An effective calculation for the quasi-inverse of a continuous ...
    • Special issue on pattern recognition techniques in data mining 

      Boixader Ibáñez, Dionís (Elsevier, 2017-07-01)
      Article
      Accés obert
    • T-generable indistinguishability operators and their use for feature selection and classification. 

      Armengol, Eva; Boixader Ibáñez, Dionís; Garcia-Cerdaña, Angel; Recasens Ferrés, Jorge (2019)
      Article
      Accés obert
    • T-Indistinguishability Operators with respect to Ordinal Sums. 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2012)
      Text en actes de congrés
      Accés obert
    • The Length and Betweenness Relations of Indistinguishability Operators 

      Boixader Ibáñez, Dionís; Jacas Moral, Juan; Recasens Ferrés, Jorge (1999-06)
      Article
      Accés restringit per política de l'editorial
      The most common ways used to generate indistinguishability operators, namely as transitive closure of reexive and symmetric fuzzy relation, via the Representation Theorem and as decomposable relations, is related for ...