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. ...