Ara es mostren els items 30-49 de 187

    • Desde un biberón hasta una catedral 

      Bendito Pérez, Enrique; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2010)
      Comunicació de congrés
      Accés obert
    • Dirichlet-to-Robin maps on finite networks 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2015-04-01)
      Article
      Accés obert
      Our aim is to characterize those matrices that are the response matrix of a semi positive definite Schrodinger operator on a circular planar network. Our findings generalize the known results and allow us to consider both ...
    • Dirichlet-to-Robin matrix on networks 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2014)
      Article
      Accés obert
      In this work, we de ne the Dirichlet{to{Robin matrix associated with a Schr odinger type matrix on general networks, and we prove that it satis es the alternating property which is essential to characterize those matrices ...
    • Discrete inverse problem on grids 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2016)
      Text en actes de congrés
      Accés obert
      In this work, we present an algorithm to the recovery of the conductance of a n –dimensional grid. The algorithm is based in the solution of some overdetermined partial boundary value problems defined on the grid; that is, ...
    • Discrete Serrin's problem 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (Elsevier, 2015-03-01)
      Article
      Accés obert
      We consider here the discrete analogue of Serrin's problem: if the equilibrium measure of a network with boundary satisfies that its normal derivative is constant, what can be said about the structure of the network and ...
    • Discrete trace function and Poincaré inequality for the study of some linear systems 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2019)
      Text en actes de congrés
      Accés obert
    • Drazin inverse of singular adjacency matrices of directed weighted cycles 

      Encinas Bachiller, Andrés Marcos (2020-09-25)
      Article
      Accés obert
      We present a necessary and sufficient condition for the singularity of circulant matrices associated with directed weighted cycles. This condition is simple and independent of the order of matrices from a complexity point ...
    • Eigenvalues with respect to a weight for discrete elliptic boundary value problems 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2019)
      Text en actes de congrés
      Accés obert
    • Eigenvalues with respect to a weight for general boundary value problems on networks 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (Elsevier, 2021-04-01)
      Article
      Accés obert
      In this work we analyze self-adjoint boundary value problems on networks for Schrödinger operators, in which a part of the boundary with a Neumann condition is always considered. We first characterize when the energy is ...
    • El problema inverso de autovalores para matrices de Jacobi no negativas y bisimétricas 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José; Mitjana Riera, Margarida; Marijuan López, Carlos; Pisonero Pérez, Miriam (Universidad de Cádiz, 2023)
      Text en actes de congrés
      Accés obert
      En esta comunicación presentamos nuestros recientes resultados en el problema inverso nonegativo para matrices de Jacobi bisimétricas, que consisten en nuevas condiciones necesarias para que una lista dada de números ...
    • Equilibrium measures on finite networks. Effective resistance and hitting time 

      Carmona Mejías, Ángeles; Bendito Pérez, Enrique; Encinas Bachiller, Andrés Marcos (2001)
      Article
      Accés obert
      We aim here at showing how the equilibrium measures for a finite network can be used to obtain simple expressions for both Green and Poisson kernels and hence we can deduce nice expressions of the hitting time and the ...
    • Estimation of Fekete points 

      Bendito Pérez, Enrique; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gesto Beiroa, José Manuel (2005-05)
      Article
      Accés obert
      In this paper we present a new method to estimate Fekete points on surfaces. Although our method works in a general setting, we concentrate on its application to the unit sphere because it is the prototype problem and ...
    • Explicit inverse of a tridiagonal (p,r)-Toeplitz matrix 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2016)
      Text en actes de congrés
      Accés obert
    • Explicit inverse of a tridiagonal (p,r)-Toeplitz matrix 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (Elsevier, 2018-04-01)
      Article
      Accés obert
      We have named tridiagonal (p,r)–Toeplitz matrix to those tridiagonal matrices in which each diagonal is a quasi–periodic sequence, d(p+j)=rd(j), so with period p¿N but multiplied by a real number r. We present here the ...
    • Explicit inverse of a tridiagonal (p,r)-Toeplitz matrix 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2016)
      Text en actes de congrés
      Accés obert
    • Explicit inverse of nonsingular Jacobi matrices 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2019-06-30)
      Article
      Accés obert
      We present here the necessary and sufficient conditions for the invertibility of tridiagonal matrices, commonly named Jacobi matrices, and explicitly compute their inverse. The techniques we use are related with the solution ...
    • Fekete points in non-smooth surfaces 

      Bendito Pérez, Enrique; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gesto Beiroa, José Manuel (2006-07)
      Article
      Accés obert
      In this paper we present a procedure for the estimation of the Fekete points on a wide variety of non-regular objects in $R^3$. We understand the problem of the Fekete points in terms of the identification of good ...
    • Floquet theory for second order linear homogeneous difference equations 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2015-11-05)
      Article
      Accés obert
      In this paper we provide a version of the Floquet’s theorem to be applied to any second order difference equations with quasi-periodic coefficients. To do this we extend to second order linear difference equations with ...
    • Funciones de green en redes producto 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (Universidad de Cádiz, 2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      En esta comunicación presentaremos la versión discreta del método de separación de variables para determinar la función de Green de redes producto en términos de la función de Green de uno de las redes factores y los ...
    • Generalized linear polyominoes, Green functions and Green matrices 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2012)
      Comunicació de congrés
      Accés obert
      In this work we derive the Creen function of a generalized linear Polyomino as a suitable perturbation of the Creen function of a Hamiltonian path on it. So, our study encompasses previous work:; on polyomino-like chains.