1 citations · 1 across the 5 of their papers we have counts for
5 papers
The INIEP: Irreducible and Positive Realizations
C. R. Johnson, C. Marijuán, M. Pisonero
Our focus is upon {\it irreducible} nonnegative -by- matrix realizations of nonnegatively realizable spectra or, equivalently, characteristic polynomials. After giving some g…
On decomposable and reducible integer matrices
Carlos Marijuán, Ignacio Ojeda, Alberto Vigneron-Tenorio
We propose necessary and sufficient conditions for an integer matrix to be decomposable in terms of its Hermite normal form. Specifically, to each integer matrix of maximal row ran…
On universal realizability of spectra
Ana I. Julio, Carlos Marijuán, Miriam Pisonero +1
A list of complex numbers is said to be realizable if it is the spectrum of an entrywise nonnegative matrix. The list is said to be universall…
The NIEP
Charles R. Johnson, Carlos Marijuán, Pietro Paparella +1
The nonnegative inverse eigenvalue problem (NIEP) asks which lists of complex numbers (counting multiplicity) occur as the eigenvalues of some -by- entry-wise nonnegative…
Minimal strong digraphs
Jesús García-López, Carlos Marijuán
We introduce adequate concepts of expansion of a digraph to obtain a sequential construction of minimal strong digraphs. We characterize the class of minimal strong digraphs whose…