Enviaments recents

  • Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems 

    Amorós Torrent, Jaume; Folch Duran, Arnau; Carrera Vilanova, Miquel; López López, José; Granados García, Xavier (2019-01-01)
    Article
    Accés restringit per política de l'editorial
    Measurement Science and Technology Paper Singular spectrum analysis filtering and Fourier inversion: an efficient and fast way to improve resolution and quality of current density maps with low-cost Hall scanning systems ...
  • A note on a question of Dimca and Greuel 

    Almirón Cuadros, Patricio; Blanco Fernández, Guillem (Elsevier, 2019-01-22)
    Article
    Accés obert
    In this note we give a positive answer to a question of Dimca and Greuel about the quotient between the Milnor and Tjurina numbers of an isolated plane curve singularity in the cases of one Puiseux pair and semi-quasi-homogeneous ...
  • Algebraic methods in phylogenetics 

    Casanellas Rius, Marta; Rhodes, John (2018-12-19)
    Article
    Accés restringit per política de l'editorial
    To those outside the field, and even to some focused on empirical applications, phylogenetics may appear to have little to do with algebra. Probability and statistics are clearly important ingredients, as modeling and ...
  • Sullivan minimal models of operad algebras 

    Cirici, Joana; Roig Martí, Agustín (2019-01-01)
    Article
    Accés restringit per política de l'editorial
    We prove the existence of Sullivan minimal models of operad algebras for a quite wide family of operads in the category of complexes of vector spaces over a ¿eld of characteristic zero. Our construction is an adaptation ...
  • On the integral degree of integral ring extensions 

    Giral Silió, José María; O'Carroll, Liam; Planas Vilanova, Francesc d'Assís; Plans Berenguer, Bernat (2019-02-01)
    Article
    Accés restringit per política de l'editorial
    Let A ¿ B be an integral ring extension of integral domains with fields of fractions K and L, respectively. The integral degree of A ¿ B, denoted by dA(B), is defined as the supremum of the degrees of minimal integral ...
  • Minimal free resolutions of lattice ideals of digraphs 

    O'Carroll, Liam; Planas Vilanova, Francesc d'Assís (2018-03-02)
    Article
    Accés obert
    Based upon a previous work of Manjunath and Sturmfels for a finite, complete, undirected graph, and a refined algorithm by Eröcal, Motsak, Schreyer and Steenpaß for computing syzygies, we display a free resolution of the ...
  • On some aspects of the geometry of non integrable distributions and applications 

    Muñoz Lecanda, Miguel Carlos (American Institute of Mathematical Sciences, 2018-12-01)
    Article
    Accés obert
    We consider a regular distribution D in a Riemannian manifold (M, g). The LeviCivita connection on (M, g) together with the orthogonal projection allow to endow the space of sections of D with a natural covariant derivative, ...
  • Lyubeznik numbers of local rings and linear strands of graded ideals 

    Álvarez Montaner, Josep (2018-09-01)
    Article
    Accés obert
    In this work, we introduce a new set of invariants associated to the linear strands of a minimal free resolution of a -graded ideal . We also prove that these invariants satisfy some properties analogous to those of Lyubeznik ...
  • Decomposition spaces, incidence algebras and Mobius inversion III: the decomposition space of Möbius intervals 

    Gálvez Carrillo, Maria Immaculada; Kock, Joachim; Tonks, Andrew (2018-08-20)
    Article
    Accés restringit per política de l'editorial
    Decomposition spaces are simplicial 8-groupoids subject to a certain exactness condition, needed to induce a coalgebra structure on the space of arrows. Conservative ULF functors (CULF) between decomposition spaces induce ...
  • Decomposition spaces, incidence algebras and Mobius inversion II: Completeness, length filtration, and finiteness 

    Gálvez Carrillo, Maria Immaculada; Kock, Joachim; Tonks, Andrew (2018-07-31)
    Article
    Accés restringit per política de l'editorial
    This is the second in a trilogy of papers introducing and studying the notion of decomposition space as a general framework for incidence algebras and Möbius inversion, with coefficients in 8-groupoids. A decomposition ...
  • Decomposition spaces, incidence algebras and Möbius inversion I: basic theory 

    Gálvez Carrillo, Maria Immaculada; Kock, Joachim; Tonks, Andrew (2018-06-20)
    Article
    Accés restringit per política de l'editorial
    This is the first in a series of papers devoted to the theory of decomposition spaces, a general framework for incidence algebras and Möbius inversion, where algebraic identities are realised by taking homotopy cardinality ...
  • Convexity of the moment map image for torus actions on b(m)-symplectic manifolds 

    Miranda Galcerán, Eva; Guillemin, Victor; Weitsman, Jonathan (Royal Society, 2018-10-28)
    Article
    Accés obert
    We prove a convexity theorem for the image of the moment map of a Hamiltonian torus action on a bm-symplectic manifold. This article is part of the theme issue ‘Finite dimensional integrable systems: new trends and methods

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