Now showing items 1-8 of 8

    • Circular chains of chinese dice 

      Piza Volio, Eduardo; Schubert, Leo (2010-04-16)
            In this paper we study Chinese dice, mathematical objects similar to ordinary dice but allowing repetition among their face values.We say that a die A is preferred over a die B (written A B) if A wins more frequently ...
    • Estudio de las métricas inducidas por un análisis en componentes principales 

      Piza Volio, Eduardo (2009-02-18)
      En este artículo se estudia una amplia gama de métricas inducidas obtenidas al realizar un Análisis en Componentes Principales con fines exploratorios, así como algunas de sus consecuencias. Se demuestra que la aplicación ...
    • Graph dominance by rook domains for Znp and Zn3 × Zm2 graphs 

      Piza Volio, Eduardo (2009-02-20)
      Described within is the problem of finding near-minimum dominating subsets of agiven graph by rook domains. Specifically, we study the graphs of the kind ZnpandZn3×Zm2and introduce a simulated annealing algorithm to compute ...
    • Hércules contra la Hidra y la muerte del Internet 

      Piza Volio, Eduardo (2011-04-29)
      Hercules killed the Hydra of Lerna in a bloody battle—the second of the labor tasks imposed upon him in atonement for his hideous crimes. The Hydra was a horrible, aggressive mythological monster with many heads and poisonous ...
    • Nuevas técnicas de particionamiento en clasificación automática 

      Piza Volio, Eduardo; Murillo Fernández, Álex; Trejos Zelaya, Javier (2009-02-18)
      In this article there are exposed some new thechniques for hte search of global optima inthe partitioning problem in Cluster Analysis. With these thechniques the results are sensibly improved with respect to the traditional ...
    • search of hadamard matrices by turyn sequences 

      Piza Volio, Eduardo (2011-07-08)
      In this paper we study the Hadamard matrices and some algorithms to generate them. We review some theoretical aspects about Hadamard's conjecture, which asserts that every positive integer multiple of 4 is a Hadamard number. ...
    • Sobre los números de Hal y Lah 

      Piza Volio, Eduardo (2009-02-20)
      In this article we study some properties concerning the Hal (H kn ) and Lah numbers(Lkn ), which are those that arise in the theory of combinatorics in association with the‘upward and downward factorial polynomials’ [x]n ...
    • Triángulos casi congruentes 

      Piza Volio, Eduardo (2012-03-29)
      En este artículo se estudian los triángulos casi congruentes, que consisten en las parejas de triángulos que tienen exactamente 5 de sus 6 elementos congruentes. Se caracterizan todas las soluciones enteras a este problema. ...