### Recent Submissions

• #### Problema 168 ﻿

(Real Sociedad Matemática Española, 2010)
Article
Open Access
• #### Eigenvalues with respect to a weight for general boundary value problems on networks ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ...