Indices of diagonalizable and universal realizability of spectra

Charles R. Johnson, Ana I. Julio, Ricardo L. Soto

A list $\Lambda =\{{\lambda }_1,\dots ,{\lambda }_n\}$ of complex numbers (repeats allowed) is said to be \textit{realizable} if it is the spectrum of an entrywise nonnegative matrix $A$. $\Lambda$ is \text…