C. R. Johnson

collaborators

2 papers

math.CO2026

The INIEP: Irreducible and Positive Realizations

C. R. Johnson, C. Marijuán, M. Pisonero

Our focus is upon {\it irreducible} nonnegative $n$ -by- $n$ matrix realizations of nonnegatively realizable spectra or, equivalently, characteristic polynomials. After giving some g…

math.CA2018

Spectra of Tridiagonal Matrices over a Field

R. S. Costas-Santos, C. R. Johnson

We consider spectra of $n$ -by- $n$ irreducible tridiagonal matrices over a field and of their $n - 1$ -by- $n - 1$ trailing principal submatrices. The real symmetric and complex Hermitian…