Recent Submissions

  • Problema 168 

    Bendito Pérez, Enrique; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Mitjana Riera, Margarida (Real Sociedad Matemática Española, 2010)
    Article
    Open Access
  • 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
    Restricted access - publisher's policy
    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 ...
  • Drazin inverse of singular adjacency matrices of directed weighted cycles 

    Encinas Bachiller, Andrés Marcos (2020-09-25)
    Article
    Open Access
    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 ...
  • Group inverse matrix of the normalized Laplacian on subdivision networks 

    Carmona Mejías, Ángeles; Mitjana Riera, Margarida; Monsó Burgués, Enrique P.J. (2020)
    Article
    Open Access
    In this paper we consider a subdivision of a given network and we show how the group inverse matrix of the normalized laplacian of the subdivision network is related to the group inverse matrix of the normalized laplacian ...
  • The group inverse of some circulant matrices 

    Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, María José; Mitjana Riera, Margarida (Elsevier, 2020-11-12)
    Article
    Restricted access - publisher's policy
    In a previous work the authors presented the necessary and sufficient conditions for the invertibility of some circulant matrices that depend on three real parameters and, moreover, we obtained a closed formula for their ...