Now showing items 1-20 of 21

    • Computing jumping numbers and multiplier ideals in two-dimensional regular local rings 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran (Universitat de Barcelona. Edicions i Publicacions, 2014)
      Conference report
      Restricted access - publisher's policy
      We give a new algorithm that computes the jumping numbers with their multiplicities and multiplier ideals of any ideal in a regular two-dimensional local ring.
    • Constancy regions of mixed multiplier ideals in two-dimensional local rings with rational singularities 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2018)
      Article
      Open Access
      The aim of this paper is to study mixed multiplier ideals associated with a tuple of ideals in a two-dimensional local ring with a rational singularity. We are interested in the partition of the real positive orthant given ...
    • Depth from the visual motion of a planar target induced by zooming 

      Alenyà Ribas, Guillem; Alberich Carramiñana, Maria; Torras, Carme (IEEE, 2007)
      Conference report
      Open Access
      Robot egomotion can be estimated from an acquired video stream up to the scale of the scene. To remove this uncertainty (and obtain true egomotion), a distance within the scene needs to be known. If no a priori knowledge ...
    • Determining plane curve singularities from its polars 

      González Alonso, Víctor; Alberich Carramiñana, Maria (2016-01-10)
      Article
      Open Access
      This paper addresses a very classical topic that goes back at least to Plücker: how to understand a plane curve singularity using its polar curves. Here, we explicitly construct the singular points of a plane curve singularity ...
    • Effective computation of base points of ideals in two-dimensional local rings 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Blanco Fernández, Guillem (2018-01-04)
      Article
      Open Access
      © 2018 Elsevier Ltd. We provide an algorithm that allows to describe the minimal log-resolution of an ideal in a smooth complex surface from the minimal log-resolution of its generators. In order to make this algorithm ...
    • Experiència pràctica de comunicació de Matemàtiques a la ciutadania i a secundària 

      Alberich Carramiñana, Maria (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2012-02-07)
      Conference lecture / Conference report
      Open Access
    • Experiència pràctica de comunicació de Matemàtiques a la ciutadania i a secundària – 2a fase 

      Alberich Carramiñana, Maria; Barja Yáñez, Miguel Ángel; Borràs Sol, Júlia; Plans Berenguer, Bernat; Quer Bosor, Jordi; Thomas, Federico; Torras, Carme; Xambó Descamps, Sebastián (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2013-02-08)
      Conference report / Conference lecture
      Restricted access - author's decision
      El projecte implementa experiències pràctiques dels estudis universitaris de matemàtiques (grau, llicenciatura i màsters) en l'àmbit de la docència i la divulgació científica. La finalitat divulgativa pretén fomentar ...
    • Flagged parallel manipulators 

      Alberich Carramiñana, Maria; Thomas, Federico; Torras, Carme (IEEE, 2007)
      Article
      Open Access
      The conditions for a parallel manipulator to be flagged can be simply expressed in terms of linear dependencies between the coordinates of its leg attachments, both on the base and on the platform. These dependencies permit ...
    • ImaginaryBCN: cuaderno de seguimiento 

      Alberich Carramiñana, Maria; Buendia Bordera, Jordi; Dachs Cadefau, Ferran; Sabater Montaner, Anna; Sánchez Díaz, Emilio José (2012)
      Other
      Open Access
      Guia didàctica de l'exposició Imaginary/BCN. La mirada matemàtica, les arts i el patrimoni. Barcelona, del 17 de març al 6 de maig de 2012
    • Monomial generators of complete planar ideals 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Blanco Fernández, Guillem (2020-01-01)
      Article
      Restricted access - publisher's policy
      We provide an algorithm that computes a set of generators for any complete ideal in a smooth complex surface. More interestingly, these generators admit a presentation as monomials in a set of maximal contact elements ...
    • Multiplicities of jumping points for mixed multiplier ideals 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran; González Alonso, Víctor (Springer, 2019-01-01)
      Article
      Open Access
      In this paper we make a systematic study of the multiplicity of the jumping points associated to the mixed multiplier ideals of a family of ideals in a complex surface with rational singularities. In particular we study ...
    • Multiplicity and Poincaré series for mixed multiplier ideals 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran; González Alonso, Víctor (2018)
      Conference report
      Restricted access - publisher's policy
    • Multiplicity and Poincaré series for mixed multiplier ideals 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran; González Alonso, Víctor (2018-09)
      Article
      Open Access
    • Multiplier ideals in two-dimensional local rings with rational singularities 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran (2016)
      Article
      Restricted access - publisher's policy
      The aim of this paper is to study jumping numbers and multiplier ideals of any ideal in a two-dimensional local ring with a rational singularity. In particular we reveal which information encoded in a multiplier ideal ...
    • New algebraic conditions for the identification of the relative position of two coplanar ellipses 

      Alberich Carramiñana, Maria; Elizalde, Borja; Thomas, Federico (2017-05-01)
      Article
      Open Access
      The identification of the relative position of two real coplanar ellipses can be reduced to the identification of the nature of the singular conics in the pencil they define and, in general, their location with respect to ...
    • Partially flagged parallel manipulators: singularity charting and avoidance 

      Alberich Carramiñana, Maria; Garolera, M; Thomas, Federico; Torras, Carme (2009-08)
      Article
      Open Access
      There are only three 6-SPS parallelmanipulatorswith triangular base and platform, i.e., the octahedral, the flagged, and the partially flagged, which are studied in this paper. The forward kinematics of the octahedralmanipulator ...
    • Poicaré series for mixed multiplier ideals 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran; González Alonso, Víctor (2018)
      Article
      Open Access
      We present a generalization of the Poincaré series to the case of mixed multiplier ideals. For that, we will recall some results about how we can compute the jumping walls associated to a mixed multiplier ideal and introduce ...
    • Poincare series of multiplier ideals in two-dimensional local rings with rational singularities 

      Alberich Carramiñana, Maria; Álvarez Montaner, Josep; Dachs Cadefau, Ferran; González Alonso, Víctor (2017-01-02)
      Article
      Open Access
      We study the multiplicity of the jumping numbers of an mm-primary ideal a in a two-dimensional local ring with a rational singularity. The formula we provide for the multiplicities leads to a very simple and efficient ...
    • Recovering the epipolar direction from two affine views of a planar object 

      Alberich Carramiñana, Maria; Alenyà Ribas, Guillem; Andrade-Cetto, Juan; Martinez, Elisa; Torras, Carme (Academic Press, 2008)
      Article
      Open Access
      The mainstream approach to estimate epipolar geometry from two views requires matching the projections of at least 4 non-coplanar points in the scene, assuming a full projective camera model. Our work deviates from this ...
    • The ultrametric space of plane branches 

      Abío Roig, Ignasi; Alberich Carramiñana, Maria; González Alonso, Víctor (2010-08)
      External research report
      Open Access
      We study properties of the space of irreducible germs of plane curves (branches), seen as an ultrametric space. We provide various geometrical methods to measure the distance between two branches and to compare distances ...