Now showing items 21-40 of 109

    • Approximating proximities by similarities 

      Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Univ. Malaga, 2008)
      Conference report
      Open Access
      In this paper an algorithm to find a similarity close to a proximity or tolerance relation R is given. The obtained similarity is closer to R than its transitive closure or any transitive opening of R.
    • Aproximación de Proximidades por Similitudes 

      Garmendia Salvador, Luis; Recasens Ferrés, Jorge (Center for Soft Computing, 2008)
      Conference report
      Open Access
      En este trabajo se presenta un algoritmo para hallar una relaci´on de similitud próxima a una relación de proximidad (i.e.: una relación de tolerancia) R dada. La relación de similitud obtenida es más próxima a R que su ...
    • Apunts de Matemàtiques II 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2013)
      Image
      Open Access
    • Apunts i exercicis de Matemàtiques II 

      Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2013)
      Lecture notes / Problem statement, exercise
      Open Access
    • 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 ...
    • Consequence operators, interior operators and fuzzy relations 

      Elorza Barbajero, Jorge; Recasens Ferrés, Jorge (2022-12-01)
      Article
      Restricted access - publisher's policy
      In this article the relationship between fuzzy consequence and fuzzy interior operators with fuzzy relations is analyzed. While the situation has been studied in depth if the fuzzy relation is a *-preorder it is not the ...
    • 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
      Open Access
    • 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
    • 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 ...
    • 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 ...
    • Exercicis 

      Congost Iglesias, M. Assumpta; Boixader Ibáñez, Dionís; Recasens Ferrés, Jorge (Universitat Politècnica de Catalunya, 2008)
      Problem statement, exercise
      Open Access
    • 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, ...
    • Fifty years of similarity relations: a survey of foundations and applications 

      Recasens Ferrés, Jorge (2021-11-18)
      Article
      Open Access
      On the occasion of the 50th anniversary of the publication of Zadeh's significant paper Similarity Relations and Fuzzy Orderings, an account of the development of similarity relations during this time will be given. Moreover, ...
    • 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 ...