• Modelos minimales de la recta hiperreal 

      Alvarado Jiménez, William (2009-02-18)
      A new proof of the existence of minimal models of the hiperreal line is obtained in terms of a combinatorial property of Ramsey ultrafilters over a countable set.
    • Particiones óptimas: características y calidad de sus aproximaciones 

      Labrèche, Said (2009-02-18)
      In the part, we present a factorial approach for clustering following the least squares criterion, for every choice of the metrics in the individual space. We deduce that the between-clusters inertia has an upper bound ...