Now showing items 1-20 of 92

    • A geometric approach to dense Cayley digraphs of finite Abelian groups 

      Aguiló Gost, Francisco de Asis L.; Fiol Mora, Miquel Àngel; Pérez Mansilla, Sonia (Elsevier, 2016)
      Conference report
      Open Access
      We give a method for constructing infinite families of dense (or eventually likely dense) Cayley digraphs of finite Abelian groups. The diameter of the digraphs is obtained by means of the related {\em minimum distance ...
    • A Koszul complex over skew polynomial rings 

      Álvarez Montaner, Josep; Boix, Alberto F.; Zarzuela Armengou, Santiago (2019-01-01)
      Article
      Open Access
      We construct a Koszul complex in the category of left skew polynomial rings associated with a flat endomorphism that provides a finite free resolution of an ideal generated by a Koszul regular sequence
    • A note on a conjecture of Xiao 

      Barja Yáñez, Miguel Ángel; Zucconi, Franco (1998)
      Article
      Open Access
    • A note on a question of Fujita and a conjecture of Xiao 

      Barja Yáñez, Miguel Ángel (1998)
      Article
      Open Access
    • A note on Bernstein–Sato ideals 

      Álvarez Montaner, Josep (2022-10-31)
      Article
      Open Access
      We define the Bernstein–Sato ideal associated to a tuple of ideals and we relate it to the jumping points of the corresponding mixed multiplier ideals.
    • A Torelli theorem for the moduli space of parabolic rank two vector bundles over curves. 

      Balaji, V.; Baño Rollin, Sebastian del; Biswas, Indranil (1998)
      Article
      Open Access
      Let S (respectively, S') be a finite subset of a compact connected Riemann surface X (respectively, X') of genus at least two. Let M (respectively, M') denote a moduli space of parabolic stable bundles of rank two over X ...
    • Algebra and geometry in Pietro Mengoli (1625-1686) 

      Massa Esteve, Maria Rosa (2003)
      Article
      Open Access
      One of the most important steps in the research carried out in the seventeenth century into new ways of calculating quadratures was the proposal of algebraic procedures. Pietro Mengoli (1625-1686), probably the most ...
    • Algebraic description of jacobians isogeneous to certain prym varieties with polarization (1,2) 

      Enolski, Viktor Z.; Fedorov, Yuri (2018-01-01)
      Article
      Open Access
      For a class of non-hyperelliptic genus 3 curves C which are twofold coverings of elliptic curves E, we give an explicit algebraic description of all birationally nonequivalent genus 2 curves whose Jacobians are degree 2 ...
    • Algebraic phylogenetic reconstruction based on proteins and its application to Persea americana 

      Pérez Gonzalo, Raül (Universitat Politècnica de Catalunya, 2018-09)
      Bachelor thesis
      Open Access
      Phylogenetic reconstruction methods attempt to infer the evolutionary relationships among a group of species. Apart from classical reconstruction methods, new methods have been developed based on algebraic relationships ...
    • Analysis of satellite constellations for the continuous coverage of ground regions 

      Dai, Guangming; Chen, Xiaoyu; Wang, Maocai; Fernández Aréizaga, Elena; Nguyen, Tuan Nam; Reinelt, Gerhard (2017-11-01)
      Article
      Open Access
      This paper studies the problem of analyzing multisatellite constellations with respect to their coverage capacity of areas on Earth’s surface. The geometric configuration of constellation projection points on Earth’s surface ...
    • Approximation of tensor fields on surfaces of arbitrary topology based on local Monge parametrizations 

      Torres Sánchez, Alejandro; Santos Oliván, Daniel; Arroyo Balaguer, Marino (2020-03-15)
      Article
      Open Access
      We introduce a new method, the Local Monge Parametrizations (LMP) method, to approximate tensor fields on general surfaces given by a collection of local parametrizations, e.g. as in finite element or NURBS surface ...
    • Asymptotic enumeration of non-crossing partitions on surfaces 

      Rué Perna, Juan José; Sau, Ignasi; Thilikos Touloupas, Dimitrios (2013-03-01)
      Article
      Open Access
      We generalize the notion of non-crossing partition on a disk to general surfaces with boundary. For this, we consider a surface S and introduce the number CS(n) of noncrossing partitions of a set of n points laying on the ...
    • Automatic generation of hexahedral meshes for volumes with non-planar surfaces using the multi-sweeping method 

      Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2010)
      Conference report
      Open Access
      One of the most used algorithms to generate hexahedral meshes for extrusion volumes is the multi-sweeping method. The algorithm decomposes the geometry into many-to-one sub-volumes and then meshes each sub-volume ...
    • Automorphisms of Thompson groups 

      Bergadà Batlles, Roger (Universitat Politècnica de Catalunya, 2021-07)
      Master thesis
      Open Access
      In this work, based on a Brin's article, we explain the structure of automorphism group of F, via a short exact sequence involving the subgroup of automorphisms of F together with the product of two copies of Thompson s ...
    • Álgebra geométrica y geometrías ortogonales 

      Xambó Descamps, Sebastián (Real Sociedad Matemática Española, 2016-10)
      Article
      Open Access
    • Bernstein–Sato theory for determinantal ideals in positive characteristic 

      López Sancha, Pedro (Universitat Politècnica de Catalunya, 2023-05-24)
      Bachelor thesis
      Open Access
      Covenantee:   University of Utah
      Sigui R un anell de polinomis sobre un cos k. Una varietat algebraica sobre k és un conjunt de punts on s'anul·len alguns polinomis de R. Amb la finalitat d'estudiar aquestes varietats i les seves singularitats, una pràctica ...
    • Black body radiation calculus through fermionic string theory 

      Silva de Barcellos, Jorge Luiz; Fonseca Casas, Pau (2018-03-25)
      Research report
      Restricted access - author's decision
    • Blending isogeometric analysis and local maximum entropy meshfree approximants 

      Rosolen, Adrián; Arroyo Balaguer, Marino (2013-09)
      Article
      Open Access
      We present a method to blend local maximum entropy (LME) meshfree approximants and isogeometric analysis. The coupling strategy exploits the optimization program behind LME approximation, treats isogeometric and LME basis ...
    • Computing optimal shortcuts for networks 

      Garijo Royo, Delia; Marquez Pérez, Alberto; Rodríguez, Natalia; Silveira, Rodrigo Ignacio (Elsevier, 2019-11-16)
      Article
      Open Access
      We study augmenting a plane Euclidean network with a segment, called a shortcut, to minimize the largest distance between any two points along the edges of the resulting network. Problems of this type have received ...
    • Connect the dot: computing feed-links for network extension 

      Speckmann, Bettina; Silveira, Rodrigo Ignacio; Aronov, Boris; Buchin, Kevin; Buchin, Maike; Jansen, Bart; De Jong, Tom; Kreveld, Marc van; Loffler, Maarten; Luo, Jun (2011-12-20)
      Article
      Open Access
      Road network analysis can require distance from points that are not on the network themselves. We study the algorithmic problem of connecting a point inside a face (region) of the road network to its boundary while ...