Now showing items 1-4 of 4

    • Fractal negations 

      Mayor Forteza, Gaspar; Calvo Sánchez, Tomasa (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1994)
      Article
      Open Access
      From the concept of attractor of a family of contractive affine transformations in the Euclidean plane R², we study the fractality property of the De Rham function and other singular functions wich derive from it. In ...
    • Idempotent operators on a finite chain 

      Mas Grimalt, Margarita; Torrens Sastre, Joan; Calvo Sánchez, Tomasa; Carbonell Huguet, Marc (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
      Article
      Open Access
      This work is devoted to find and study some possible idempotent operators on a finite chain $L$. Specially, all idempotent operators on $L$ which are associative, commutative and non-decreasing in each place are ...
    • On the representation of local indistinguishability operators 

      Calvo Sánchez, Tomasa; Recasens Ferrés, Jorge (2021-05-01)
      Article
      Restricted access - publisher's policy
      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 ...
    • Weighted sums of aggregation operators 

      Calvo Sánchez, Tomasa; Baets, Bernard de; Mesiar, Radko (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 1999)
      Article
      Open Access
      he aim of this work is to investigate when a weighted sum, or in other words, a linear combination, of two or more aggregation operators leads to a new aggregation operator. For weights belonging to the real unit interval, ...