Now showing items 1-4 of 4

  • Clasificación de 3-semigrupos numéricos mediante L-formas 

    Aguiló Gost, Francisco de Asis L.; Marijuan López, Carlos (Universidad de Almería, 2012)
    Conference report
    Restricted access - publisher's policy
    Un semigrupo num erico generado por tres elementos tiene asociadas una o dos teselaciones peri odicas del plano generadas por una baldosa en forma de L. Se conocen algunas propiedades combinatorias del semigrupo en t ...
  • Classification of numerical 3-semigroups by means of L-shapes 

    Aguiló Gost, Francisco de Asis L.; Marijuan López, Carlos (2014-06-01)
    Article
    Open Access
    We recall L-shapes, which are minimal distance diagrams, related to weighted 2-Cayley digraphs, and we give the number and the relation between minimal distance diagrams related to the same digraph. On the other hand, we ...
  • On graph combinatorics to improve eigenvector-based measures of centrality in directed networks 

    Arratia Quesada, Argimiro Alejandro; Marijuan López, Carlos (Elsevier, 2016-09-01)
    Article
    Open Access
    We present a combinatorial study on the rearrangement of links in the structure of directed networks for the purpose of improving the valuation of a vertex or group of vertices as established by an eigenvector-based ...
  • Practical challenges that arise when clustering the web using spectral methods 

    Arratia Quesada, Argimiro Alejandro; Marijuan López, Carlos (Generalitat de Catalunya. Departament de Cultura i Mitjans de Comunicació, 2010)
    Conference report
    Restricted access - publisher's policy
    This is a report on an implementation of a spectral clustering algorithm for classifying very large internet sites, with special emphasis on the practical problems encountered in developing such a data mining system. ...