Reports de recerca: Enviaments recents

Ara es mostren els items 25-36 de 103

    • Lyubeznik table of sequentially Cohen-Macaulay rings 

      Álvarez Montaner, Josep (2013-04)
      Report de recerca
      Accés obert
      We prove that sequentially Cohen-Macaulay rings in positive characteristic, as well as sequentially Cohen-Macaulay Stanley-Reisner rings in any characteristic, have trivial Lyubeznik table. Some other con gurations of ...

    • Addendum to "Frobenius and Cartier algebras of Stanley-Reisner rings" [J.Algebra 358 (2012), 162-177] 

      Álvarez Montaner, Josep; Yanagawa, Kohji (2013-05)
      Report de recerca
      Accés obert
      We give a purely combinatorial characterization of complete Stanley-Reisner rings having a principally generated (equivalently, nitely generated) Cartier algebra

    • Random test examples with known minimum for convex semi-infinite programming problems 

      Ferrer Biosca, Alberto; Miranda Galcerán, Eva (2013)
      Report de recerca
      Accés obert
      A signi cant research activity has occurred in the area of convex semi- in nite optimization in the recent years. Many new theoretical, algorithm and computational contribution has been obtained . Despite these numerous ...

    • Stability of a pipeline hydraulic fluid with one end fixed 

      García Planas, María Isabel; Mediano Valiente, Begoña (2011-09-05)
      Report de recerca
      Accés obert
      The dynamics and stability of pipes conveying fluid has been studied thoroughly in the last decades. In this paper we study the stability in the Liapunov sense, of a clamped-pinned pipe conveying fluid at a low speed. After ...

    • Some constructions for the fractional Laplacian on noncompact manifolds 

      Banica, Valeria; González Nogueras, María del Mar; Sáez, Mariel (2012-12)
      Report de recerca
      Accés obert
      We give a de nition of the fractional Laplacian on some noncompact manifolds, through an extension problem introduced by Ca arelli-Silvestre. While this de nition in the compact case is straightforward, in the noncompact ...

    • Classi fication of monogenic invariant subspaces and uniparametric linear control systems 

      Compta Creus, Albert; Ferrer Llop, Josep (2012-12)
      Report de recerca
      Accés obert
      The classification of the invariant subspaces of an endomorphism has been an open problem for a long time, and it is a ”wild” problem in the general case. Here we obtain a full classification for the monogenic ones. Some ...

    • Miniversal deformations of observable marked matrices 

      Compta Creus, Albert; Ferrer Llop, Josep; Peña Carrera, Marta (2012)
      Report de recerca
      Accés obert
      Given the set of vertical pairs of matrices M¿ Mm,n(C)×Mn(C) keeping the subspace Cd×{0} ¿ Cn invariant, we compute miniversal deformations of a given pair when it is observable and the subspace Cd × {0} is marked. ...

    • On a Poincaré lemma for singular foliations and geometric quantization 

      Miranda Galcerán, Eva; Solha, Romero (2013-01)
      Report de recerca
      Accés obert
      In this paper we prove a Poincar e lemma for forms tangent to a foliation with nondegenerate singularities given by an integrable system on a symplectic manifold. As a consequence, the Kostant complex in Geometric ...

    • Geometric Quantization of real polarizations via sheaves 

      Miranda Galcerán, Eva; Presas, Francisco (2013-01)
      Report de recerca
      Accés obert
      In this article we develop tools to compute the Geometric Quantization of a symplectic manifold with respect to a regular Lagrangian foliation via sheaf cohomology. The starting point is the definition of representation ...

    • Layer solutions for the fractional Laplacian on hyperbolic space: existence, uniqueness and qualitative properties 

      González Nogueras, María del Mar; Saéz, Mariel; Sire, Yannick (2012-12)
      Report de recerca
      Accés obert
      where (¿ Hn) corresponds to the fractional Laplacian on hyperbolic space for 2 (0; 1) and f is a smooth nonlinearity that typically comes from a double well potential. We prove the existence of heteroclinic connections ...

    • Transversality of homoclinic orbits to hyperbolic equilibria in a Hamiltonian system, via the Hamilton-Jacobi equation 

      Delshams Valdés, Amadeu; Gutiérrez Serrés, Pere; Pacha Andújar, Juan Ramón (2012-07)
      Report de recerca
      Accés obert
      The key point of our approach is to write the invariant manifolds in terms of generating functions, which are solutions of the Hamilton-Jacobi equation. In some examples, we show that it is enough to analyse the phase ...

    • Three lectures on local cohomology modules supported on monomial ideals 

      Álvarez Montaner, Josep (2012-09)
      Report de recerca
      Accés obert
      These notes are an extended version of a set of lectures given at ”MONICA: MONomial Ideals, Computations and Applications”, at the CIEM, Castro Urdiales (Cantabria, Spain) in July 2011. The goal of these lectures is to ...