Now showing items 1-19 of 19

  • 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
    Restricted access - publisher's policy
    © 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
  • 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 ...
  • The ultrametric space of plane branches 

    Abío Roig, Ignasi; Alberich Carramiñana, Maria; González Alonso, Víctor (2011)
    Article
    Restricted access - publisher's policy
    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 ...