On some conjectures on the spectra of τ-matrices
Volker Mehrmann · Linear and Multilinear Algebra · 1984
We will consider three conjectures of Schneider and Varga concerning the location of eigenvalues of ω- and τ-matices in the complex plane, and extend the known results to n ⩽ 4. We will further show that in the neighborhood of certain cyclic M-matices the conjectures hold for all n.