Enviaments recents

  • Bounded solutions of self-adjoint second order linear difference equations with periodic coefficients 

    Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, M. Jose (2018-02-25)
    Article
    Accés obert
    In this work we obtain easy characterizations for the boundedness of the solutions of the discrete, self–adjoint, second order and linear unidimensional equations with periodic coefficients, including the analysis of the ...
  • Second order linear difference equations 

    Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, M. Jose (2017-12-04)
    Article
    Accés obert
    We provide the explicit solution of a general second order linear difference equation via the computation of its associated Green function. This Green function is completely characterized and we obtain a closed expression ...
  • Vertex-disjoint cycles in bipartite tournaments 

    González Moreno, Diego; Balbuena Martínez, Maria Camino Teófila; Olsen, Mika (2016-10)
    Article
    Accés obert
    Let k=2 be an integer. Bermond and Thomassen conjectured that every digraph with minimum out-degree at least 2k-1 contains k vertex-disjoint cycles. Recently Bai, Li and Li proved this conjecture for bipartite digraphs. ...
  • Explicit inverse of a tridiagonal (p,r)-Toeplitz matrix 

    Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, M. Jose (Elsevier, 2018-04-01)
    Article
    Accés restringit per política de l'editorial
    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 ...
  • 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 ...
  • Dirichlet-to-Robin matrix on networks 

    Arauz Lombardia, 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 ...
  • Recovering the conductances on grids 

    Arauz Lombardia, Cristina; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos (2014)
    Article
    Accés restringit per política de l'editorial
    In this work, we present an algorithm to the recovery of the conductance of a 2– dimensional grid. The algorithm is based in the solution of some overdetermined partial boundary value problems defined on the grid.
  • Resistance distances on networks 

    Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (2017)
    Article
    Accés obert
    This paper aims to study a family of distances in networks associated witheffective resistances. Speci cally, we consider the e ective resistance distance with respect to a positive parameter and a weight on the vertex ...
  • The group inverse of subdivision networks 

    Carmona Mejías, Ángeles; Mitjana Riera, Margarida; Monsó Burgués, Enrique P.J. (2016-10)
    Article
    Accés obert
    In this paper, given a network and a subdivision of it, we show how the Group Inverse of the subdivision network can be related to the Group Inverse of initial given network. Our approach establishes a relationship between ...
  • A family of mixed graphs with large order and diameter 2 

    Araujo Pardo, Gabriela; Balbuena Martínez, Maria Camino Teófila; Miller, Mirka; Zdimalova, Maria (2017-02)
    Article
    Accés restringit per política de l'editorial
    A mixed regular graph is a connected simple graph in which each vertex has both a fixed outdegree (the same indegree) and a fixed undirected degree. A mixed regular graphs is said to be optimal if there is not a mixed ...
  • Kirchhoff index of a non-complete wheel 

    Gago Álvarez, Silvia (2016)
    Article
    Accés obert
    In this work, we compute analitycally the Kirchhoff index and effective resistances of a weighted non–complete wheel that has been obtained by adding a vertex to a weighted cycle and some edges conveniently chosen. To this ...
  • Effective resistances and Kirchhoff index in subdivision networks 

    Carmona Mejías, Ángeles; Mitjana Riera, Margarida; Monsó Burgués, Enrique P.J. (Taylor & Francis, 2016-11-12)
    Article
    Accés obert
    We define a subdivision network ¿S of a given network ¿; by inserting a new vertex in every edge, so that each edge is replaced by two new edges with conductances that fulfill electrical conditions on the new network. In ...

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