Now showing items 21-40 of 96

  • A reformulation of entropy in the presence of indistinguishability operators 

    Recasens Ferrés, Jorge; Hernández, E (2002-06)
    Article
    Restricted access - publisher's policy
    This paper deals with the measurement of entropy when an indistinguishability relation on the set of events has been defined. Our approach states that entropy could be measured in terms of the observed distinguishability ...
  • Averaged similarities generable by single attributes 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2015)
    Conference report
    Open Access
    In a theoretical setting, the Representation Theorem is used to generate T-indistinguishability operators (fuzzy similarity relations) from a given set of fuzzy criteria. In applied domains, though, other ways of generation ...
  • Characterization of unidimensional averaged similarities 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2017-09-01)
    Article
    Open Access
    A T-indistinguishability operator (or fuzzy similarity relation) E is called unidimensional when it may be obtained from one single fuzzy subset (or fuzzy criterion). In this paper, we study when a T-indistinguishability ...
  • Comparison of different algorithms of approximation by extensional fuzzy subsets 

    Mattioli Aramburu, Gabriel; Recasens Ferrés, Jorge (Springer, 2013)
    Article
    Open Access
    How to approximate an arbitrary fuzzy subset by an adequate extensional one is a key question within the theory of Extensional Fuzzy Subsets. In a recent paper by the authors [19] different methods were provided to find ...
  • Corrigendum to “Fuzzy implication functions based on powers of continuous t-norms” [Int. J. Approx. Reason. 83 (2017) 265-297] 

    Massenet, Sabastià; Recasens Ferrés, Jorge; Torrens Serra, Joan (2019)
    Article
    Restricted access - publisher's policy
  • Discretization of fuzzy transitive relations 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2011)
    Conference report
    Restricted access - publisher's policy
  • Dualities and isomorphisms between indistinguishabilities and related concepts 

    Mattioli Aramburu, Gabriel; Recasens Ferrés, Jorge (2011)
    Conference report
    Restricted access - publisher's policy
  • Effects of crop and weed densities on the interactions between barley and Lolium rigidum in several Mediterranean locations 

    Izquierdo Figarola, Jordi; Recasens Ferrés, Jorge; Fernández-Quintanilla, C; Gill, G (2003-09)
    Article
    Open Access
    The effects of both barley and Lolium rigidum densities on weed growth and spike production and on crop yield were examined in five field experiments carried out in the Mediterranean drylands of Spain and Western Australia. ...
  • Eigenvectors and generators of fuzzy relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (-, 1992)
    Conference report
    Restricted access - publisher's policy
    A new geometric approach to the study of the eigenvectors is provided. The T-eigenvectors of a T-indistinguishability operator are characterized as its generators in the sense of the representation theorem of L. Valverde ...
  • Estructura de las similitudes 

    González del Campo, Ramón; Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Center for Soft Computing, 2008)
    Conference report
    Open Access
    En este artículo se define formalmente el concepto de estructura de similaridad, se cuenta el número de estructuras de similaridades hasta dimensión 5, se propone una nomenclatura y un algoritmo que asigna una estructura ...
  • ET-Lipschitzian aggregation operators 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (-, 2007)
    Conference report
    Open Access
    Lipschitzian and kernel aggregation operators with respect to the natural Tindistinguishability operator ET and their powers are studied. A t-norm T is proved to be ET -lipschitzian, and is interpreted as a fuzzy point and ...
  • E-T-lipschitzian and E-T-kernel aggregation operators 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (2007-12)
    Article
    Restricted access - publisher's policy
    Lipschitzian and kernel aggregation operators with respect to natural T-indistinguishability operators ET and their powers are studied. A t-norm T is proved to be ET-lipschitzian, and is interpreted as a fuzzy point and a ...
  • Extensionality with respect to indistinguishability operators 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2018-04-01)
    Article
    Open Access
    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, ...
  • Finding close T-indistinguishability operators to a given proximity 

    Garmendia Salvador, Luis; Recasens Ferrés, Jorge (-, 2007)
    Conference report
    Open Access
    Two ways to approximate a proximity relation R (i.e. a reflexive and symmetric fuzzy relation) by a T-transitive one where T is a continuous archimedean t-norm are given. The first one aggregates the transitive closure R ...
  • Finitely valued indistinguishability operators 

    Mayor, Gaspar; Recasens Ferrés, Jorge (Springer Verlag, 2010)
    Conference report
    Open Access
  • Finite-valued indistinguishability operators 

    Mayor, Gaspar; Recasens Ferrés, Jorge (2011-10)
    Article
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    Fuzzy equality relations or indistinguishability operators generalize the concepts of crisp equality and equivalence relations in fuzzy systems where inaccuracy and uncertainty is dealt with. They generate fuzzy granularity ...
  • Fixed points and generators of fuzzy relations 

    Jacas Moral, Juan; Recasens Ferrés, Jorge (1994-08)
    Article
    Restricted access - publisher's policy
    The fixed points of a T-indistinguishability operator are characterized as its generators in the sense of the Representation Theorem of Valverde. The geometric description of the set of fixed points of a reflexive and ...
  • Funciones de implicación borrosas basadas en potencias 

    Massenet, Sabastià; Recasens Ferrés, Jorge; Torrens, Joan (2016)
    Conference report
    Open Access
    La introducción de nuevas familias de funciones de implicación borrosas es una necesidad para poder elegir aquella más adecuada para una aplicación concreta. En esta línea, en este trabajo se introduce un nuevo tipo de ...
  • Fuzzy actions 

    Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (2017-01-01)
    Article
    Open Access
    This paper generalizes (fuzzifies) actions of a monoid or group on a set to deal with situations where imprecision and uncertainty are present. Fuzzy actions can handle the granularity of a set or even create it by defining ...
  • Fuzzy Groups, Fuzzy Functions and Fuzzy Equivalence Relations 

    Demirci, M; Recasens Ferrés, Jorge (2004-06)
    Article
    Restricted access - publisher's policy
    To each fuzzy subgroup a fuzzy equivalence relation is associated and it is proved that a fuzzy subgroup is normal if and only if the operation of the group is compatible with its associated fuzzy equivalence relation. In ...