Ara es mostren els items 37-56 de 187

    • Eigenvalues with respect to a weight for discrete elliptic boundary value problems 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2019)
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    • 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)
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      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)
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      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
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      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)
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      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)
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    • Explicit inverse of a tridiagonal (p,r)-Toeplitz matrix 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (Elsevier, 2018-04-01)
      Article
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      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)
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    • Explicit inverse of nonsingular Jacobi matrices 

      Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José (2019-06-30)
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      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
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      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
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      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)
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      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
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      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.
    • Generalizing the bottleneck matrix 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida; Monsó Burgués, Enrique P.J. (2019)
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      Given the Laplacian matrix associated to a weighted graph and given x a single vertex of it, the bottleneck matrix (related to x) is the inverse matrix of the sub matrix of the Laplacian obtained by eliminating the row ...
    • Green function on product networks 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2012)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      Our objective is to determine the Green function of product networks in terms of the Green function of one of the factor networks and the eigenvalues and eigenfunctions of the Schr odinger operator of the other factor ...
    • Green functions for boundary value problems on product networks 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2019)
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    • Green functions on product networks 

      Arauz Lombardía, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2018-01-01)
      Article
      Accés obert
      We aim here at determining the Green function for general Schrödinger operators on product networks. The first step consists in expressing Schrödinger operators on a product network as sum of appropriate Schrödinger operators ...
    • Green matrices associated with generalized linear polyominoes 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (Elsevier, 2015)
      Article
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      A polyomino is an edge-connected union of cells in the planar square lattice. Here we consider generalized linear polyominoes; that is, the polyominoes supported by an n × 2 lattice. In this paper, we obtain the ...
    • Green operators of networks with a new vertex 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia; Mitjana Riera, Margarida (Elsevier, 2016-02)
      Article
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      Any elliptic operator defines an automorphism on the orthogonal subspace to the eigenfunctions associated with the lowest eigenvalue, whose inverse is the orthogonal Green operator. In this study, we show that elliptic ...
    • Green's function of a weighted $n$-cycle 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia; Jiménez Jiménez, María José; Mitjana Riera, Margarida (2016)
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